Questions about after usual marijuana overdoses?

About 2 weeks ago I was smoking pot with some friends and ended up with a marijuana overdose. I hallucinated and threw up and ended up in the emergency room. I have stopped doing all kinds of drugs, but I still smoke cigarettes sometimes. I haven't consumed any alcohol in about a week. I am determined to not have another relapse. The thing is, I have basically been feeling like I've lost touch with reality. It's awful. At random times it's as if I have just realized that I'm living. I'm terrified of death after my experience, and I barely remember how to live. I feel like I'm going crazy.Is this 'normal'? Will I ever feel the same? I'm so scared. Please, if anyone has ever felt this way or knows someone with a similar experience, help! Thanks in advance.