Possible PTSD. Loose. please help me.

Hello doctor. Recently I've suffered a loss of a family member. It's not the first time that I've lost someone but it's definitely the first time when I'm mature enough to comprehend everything that happened. For the very first time I've seen a person experiencing a convulsions /seizure and that really got under my skin. After that day I was not okay. Several days passed since my family members passed away, even I moved to a different city but I've developed this liking to be alone. I've always been a socially awkward guy but lately I feel I like being by myself away from the chaos. I'm not sure if this is some kind of coping mechanism but it doesn't feel right. I think I need help. I want to understand what's happening and why do I feel this way. I'm taking TEMLA 40 as instructed by my doctor for my BP. I do have prescription for Alprazolam but I don't take unless all hell are breking loose. Please help me. Thank you.