Why?

I don't understand why I get so upset and lose sleep over little things. I try to just ignore it but it keeps coming back. Why can't I just forget about it and move on? Instead it just eats at me like i have a parasite. I hate this feeling. I feel scared and worried. I know that if I gave it to God He would fix this, but I don't know how to. It just irks me to no end. I hate crying, but it drives me to tears.