really need some help here

[chris2015]

ok so here's the thing, over the past few months i've really began to noticed my memory and my overall mental ability has gone way down. the thing is this started about three years ago but has gotten progressively worse within the last few months and its gotten to the point to where its getting hard to function in day to day life. about a year ago i had a catscan and everything came back normal and a few weeks ago i had alot of blood test ran and everything came back normal again, so my doctor is thinking i might have add but she's sending me to a psycologyst next tuesday to try to get a better idea of what might be going on with me. but its really to the point to where im really scared and i dont no what to do or expect. just one quick example of some of the things that have been going on is when i got home from work today i went to heat up some food and when i plugged in the microwave i turned it on but left the food on the counter, forgetting to put it in before i turned it on. so my questions are what does some opf this sound like, should i maybe have another catscan, does it sound like maybe something degenerative (im 20), i just dont know what to do and i really need some help here.