I'm guessing the weed didn't 'agree' with you.
I don't get on with cannabis in any way shape or form, or any other hallucinogens - they all give me the heebie geebies.
I think it's VERY unlikely that your weed was laced with anything that could have a lasting effect.
My guess is that it's triggered off some latent psychosis or emotional problem you may have. You should be seeing a counsellor really, not posting here about it IMO.
Talk to your GP about it - s/he should be able to refer you to a counsellor.
Alternatively try this:
http://www.drugsline....bHbtaQCFYiX2AodtiYq0w
Contact with them is confidential and anonymous.