Free fall means when a situation is bad and out of control. It literally means when you fall from a plane or from a great height (You cannot stop this and the ending will be bad). Get in touch with means to contact someone.

To be in "freefall" means that something is going down uncontrollably and it doesn't seem to be stopping anytime soon. To "get in touch with somebody" just means to contact someone or communicate with them, it's often used when you haven't spoken to that person in a long time

(free fall) is used as an expression to indicate that something is falling rapidly or straight down. It is usually a negative situation. The literal term (free fall) is when a person jumps from a airplane to go skydiving they are in free fall from the time they leave the airplane until their parachute opens. Example: Since you left the company our sales have been in a free fall. (Since you left the company our sales steadily decreased and there is no sign that the sales will improve.) (Get in touch) refers to having some form of communication with someone; talking with someone about something. Example: If you want to get in touch with me while I am on vacation be sure to call me on my personal cell phone because it will be my only form of communication. You can also say (reach out to) in place of (get in touch). (get in touch) can also be used to indicate whether you were or weren't able to speak with someone. Example: -Did you get in touch with Jim yesterday? -No, he didn't answer the phone but I left him a voice message.