is this the end?

had a good day at work today. then-a wave of despair comes over me out of nowhere and i am bawling by the time i get home. just like someone flicked a switch or something. feeling very detached . don’t want to see anyone. don’t want to talk to anyone. don’t want to exist. my self imposed isolation has served to make me wary of people. but i hide in plain sight. feel myself slipping away. i am so damned tired. my body is aching , like i have been beaten up again. don’t know if it is depression or the meds. probably some combination thereof. but i feel like an old lady-aching in my hands,  weakness in my legs. this whole thing is pathetic. the drumbeat of self destruction seems to get louder everyday. is this the end?