Ganesh did a great job.  No need for me to add in my two cents.  Just correct your title.

Sadness and happiness

When we upsad, hopeless, depress, sad, mad, dispointing, guilty, broken heart, lost someone we love, jealous, angry, hurt and all other feeling we don't like. We might be thinking that we don't want to life or want to hurt ourself to feel better. When we look it back, that's all stupid think we ever thought. All the sadness just temporary, time will be coming and erase all the pain. I believe we can be happy. We need support from somebody else, but most important think we need to help ourself. How we help ourself to be happy? or at list not stuck in the darkness feeling? Mostly we love something to much, that make us hurt the most. I don't think that the right way to love. I'm really beleave there are nothing eternal in this life. For example the car or t-shirt we love will not in same condition after years. People will get the sickness, and also will died. By thinking that way we never over love something, but doesn't mean we not taking care what we have. The good way to love is like mother love their children, never holding back. Bad or good things we do that what we will get. If we want to have good life, we working hard for it. Don't let emotional take over our feeling. Care others and the environment.
This what I usually do when the bad feeling take over my heart:
1. Try to recognize that feelings ( I'm mad, upsad, or sad). Take a deep breath for few times. Go for walk or do something else, so we not focus on that feeling. Don't argue or saying think who hurt others persons feeling when we angry. That will making worse the situation. If we sad because broken heart or lost someone we love, we just can let it go. Might be need time to feel better, try not put ourself to using drug or be drunker. That just will hurt yourself, and never work. Meditation really help in this point. Hard to focus in the beginning, but that we relaxing our mind.
2. After we calm down, try to fix the problem.I remember someone told me. There are three kind of people . First is a dump people, who never learn from experience. Second is a learner, someone who learn from their experience. Third is a smart people who learn from others people experience, and never let the problem happen. If someone make us hurt, try to make them understand rather than punish them. Exception for the criminal

Sad and happiness

When we are upsad upset, hopeless, depress depressed, sad, mad, dispointing disappointed, feeling guilty, broken hearted, lost someone we love, jealous, angry, hurt, or occupied with any and all other feeling that we don't like, we might be thinking that we don't want to life live or want to hurt ourself ourselves to feel better. However, when we look it back at it, that's all stupid think we ever thought we realize how stupid we are to think like this. All the sadness is just temporary and this will  time will pass eventually with time be coming and erase erasing all the pain. I believe, we can be happy. Sometimes, we need support from somebody else; however, the  but most important think thing we need to do is to help ourself ourselves. How can we help ourself ourselves to be happy? Or, at list, not remain stuck to in the darkness feelings? Mostly, we love something too much, that makes us feel hurt the most. I don't think that is the right way to love. I'm really beleave I really believe that there are is nothing eternal in this life, for example, the car or the t-shirt that we love will not be in same condition after some years. People will get the sickness, and eventually, they also will died die. By thinking that this way, we will never over love something anything beyond the limits. , but Still, it doesn't mean we should not taking take care of what we have. The good way to love is like a mother, who loves their her children, never holding back. Bad or good,  things we do that what we will get what we do. If we want to have a good life, we working should work hard for it. Don't let emotional emotions take over our feeling overpower your thinking. Care others and the environment. 

This what I usually do when the bad feeling take over my heart:
1. Try to recognize that feelings ( I'm mad, upsad upset, or sad). Take a deep breath for a few times. Go for walk or do something else so as we not to focus on that feeling. When you are angry, don't argue or saying think things, which can who hurt others' persons feelings  when we angry as that will making worse make the situation worse. If we are sad because of broken heart or because of lost losing someone we love, we should just can wait to let it the feeling go. Some more time might be necessary need time to feel better. Try not to put yourself in using drugs or alcohol. That just will only hurt yourself and will never work. Meditation really helps in at this point. It is hard to focus in the beginning, but it that we relaxes ing our mind. 

2. After we you calm down, try to fix the problem. I remember someone told me that there are three kinds of people . First is a dump people dumb, who never learns from experience. Second is a learner, someone who learns from their experience. Third is a smart people one, who learns from other people's experiences and never let the problem happen. If someone make us hurt, try to make them understand rather than punish them. Exception for the to this is a criminal.