Headache memory and concentration probl.

Before two months I guess I got some kind stroke and after words I can feel this paranoidal behavior. I started staying in home due to some sort of weakness and now I can't concentrate accurately. I can't make some simpler decision. Sometimes I keep worrying about future or blame my self for past mistakes. It seems I forget to even laugh. I lost my interest in all most everything for like past two months I startd watching tons of useless videos over YouTube to forget to forget all these things and I also avoided people. It seems as if everyone will judge me or think about me in bad manner. I am in my final year with five subjects to study and it seems as if I can't even stop my thoughts. Please help even writing down my problem is becoming big problem.