Hi, clearblue, welcome to PsychCentral (PC). It does sound like anxiety. Don't know if it will help, but mentlal problems don't generally morph into wholly different ones. If your psychologist isn't worried and brushes off your worries about psychosis, then you are likely pretty safe from that.

Like RACEKA says, you probably have characteristics you've always tended to have and just kind of covered it and the pot smoking brought it out. What we feel is part of us, logical and from inside, not something that happens to us or someone gives us from the outside. It's not like a cold we catch. Smoking the pot uncovered something already genetically/chemically possible with you, not something new. My appendix burst in 2003 and I had 5 months of complications. Afterwards, because of the antibiotics, asthma showed up and I still stuggle with that. But I had genetically "weak lungs" already from my father and mother's mother. So, unless you have a genetic tendency to psychosis, have other family members with schizophrenia or something, that is not likely to result out of this years' experience.