nightmares/insomnia???

I use to dream of flashbacks and other dreams with me or someone else dying and it's starting up again. I've been staying up until 4 am and wake up from 8-10 am. The only time I've slept well was when I took coughing medicine w sleeping medicine in it when I was sick. I'm waking up with super puffy eyes and Im getting bags along with dark circles that look like a black eye. I think it's my makeup but when I try to wipe it away, it's actually just the blue from lack of sleep, and its red underneath my eyes. It's currently 2:38 am where Im at. Tea doesn't help. Only when I smoke weed is when I sleep good and I dont dream. I haven't been smoking at all lately though.