You’re on a low dose of Seroquel, a low dose of Klonopin, and some melatonin? And you’re worried about dying because you doubled up? I’d be willing to bet you could triple, quadruple, quintuple, whatever, those doses and it would be no big deal. The reason you slept so long was the Seroquel. It’s also the reason you feel drugged. Klonopin is out of your system in 8 hours, melatonin even quicker. Seroquel is like a horse tranquilizer, and even then people regularly take doses up to 900 or 1200mg.

You’re fine. The issues with nobody noticing are totally separate. I’m sure you feel alone and neglected because of it, but don’t worry about the meds. You’re not lucky to be alive because you doubled up on your meds, but it does sound like you have some other issues that might be good to work on.