Oh god, I know how you feel. It doesn't seem to be LSD, but don't let that worry you. I once had an odd chest pain after doing LSD, but it subsided eventually, and wasn't bad like I thought it was, I was just panicked about it, my point being the headache you're having has nothing to do with the chemical you took, you're just freaked out about it. Quitting marijuana is the reason for your anxiety, I felt as if I had schizophrenia and incredible anxiety after quitting myself. But I was just very panicked. So to sum it up, you ARE okay, you are just panicked from the marijuana withdrawal and the bad trip together. The migraine is unrelated, just get treatment for it. Going to the hospital is unnecessary. The bad trip along with the weed withdrawal may have caused an anxiety disorder to surface, this is now unrelated to the trip, go to a doctor and tell them you've been feeling extreme anxiety. It is nothing to worry about. You are fine, and I know just wht you're going through.