OK - lets clear a couple of things up.

When you use weed you will end up metabolising THC (and a lot of other stuff) and those metabolites can stay in your blood for days. That doesn't mean that those metabolites get you high though

I smoke a fair bit, about a gram a day. NO schwag passes these lips either - so its nice herb. I would likely fail a blood/piss test for the best part of 90 days if I quit right now.

So after a good smoke session YES you could still have some metabolites in your system. However what I would guess is that this is more like hypertension. You are worried something is wrong and this might be affecting/causing your symptoms.

I have spent some time with people who have really smoked too much weed. One person accused me of "spiking" their weed LOL - it was just nice weed and it was a bit "too nice" for them.

Over the past 10 years of smoking (make that 13 :stoned:...) I have seen people fall over, be sick, cry, wet themselves, faint and even speak in a different language. But not once did I see someone smoke a bong and then suddenly develop schizophrenia.

I do have a friend who was sectioned by the Mental Health Act - but he was already half-gone before he even took his first drag on a joint.

I'm not trying to be a smartass though - if you have a history of mental illness or some family connection then talk to a healthcare professional. Almost everyone on this board will tell you its in your head - BUT you are the only person who knows what is in YOUR head.

You have just put your brain into a significantly altered state - you didn't have such a good time of it either and this is probably your brain trying to re-enforce that whole "shit dude, don't do that again, mmmkay?" idea, it's self-defence of the brain!

Sometimes people forget what having a low tolerance is like