I'm new here!! This is my first writing

In high school I had English as a subject. I loved it and it was easy for me.
When I finished high school I went to the university to study Hotel Management and Tourism, so I decided to continue my English studies. I made that decision because I believe learning English can help me in my future career (either "the future" or "my career").
I started studying English at the Axis Institute in March of 2005 in my city. My teacher's name was Patricia. We were a group of young adults. There, I met Santiago and fell in love with him. He is my partner (you can also say "husband", "boyfriend", or "Fiancee" depending on what he is to you)! We continued studying until 2007 and I have nice(you can say "fond" when speaking of memories) memories of my English classes and classmates.
I have started to remember my knowledge of English by writing some texts on Italki and I will practice oral communication when I feel more confident.

You did really well :) I hope this helps.

Stomach Flu

 I was under the weather and had a fever last Sunday, so I thought I had a cold.  
The next day, my temperature was down so I went to work as usual, however, I had stomach pains while standing and walking so I took a half day and went to see the doctor.The doctor told me that I had a stomach flu and prescribed some medicines.But, for the past two days, I have been having trots(i don't know what this word is), and I didn't have appetite so I just stayed hydrated.I wanted to attend an English class today but I decided to be absent(or you can say "not to go" instead of " to be absent" that makes you sound like you're not a native which is not what you're going for). Now, I think I'm feeling better so I will finally eat something and go to work tomorrow! 

You did really well in composing this paragraph and although a few things sounded a bit non-native, I didn't want to change the entire paragraph as I'm sure you'll learn how to be more fluid in your writing. I hope this helps :)