I have regular headaches and forget a lot?

I have regular headaches. I was really stressed the past couple of weeks. I had the best memory that my friends told me everyday to remind them with things. But now, I forget a lot of things. I get regular headaches especially after I sneeze. I never vent my feelings or talk to someone. I always keep everything inside of me. But I don't know what to do now. It's becoming a serious problem. PLEASE HELP! What am I supposed to do?