Is my sleeping pill regimen responsible for this excessive fatigue?

Each night I take one 25mg clear gelcap of Benedryl and one mg of Melatonin. Works like a charm so why am I exhausted? Could it be from driving into town, fifteen miles, in 89 degree heat to sit at his dorm waiting for my grandson to move back into the dorm then driving to visit my girlfriend whose husband died in February ? She’s confined to an independent living facility and extremely lonely. I must have been super stressed out for this to have happened to me. I can barely move. I’m out of shape and a senior citizen (ugh).