YEs, sometime psychosis due represent an acute condition. In an acute condition, a diagnosis of acute psychosis and bi-polar basically means "something bad is happening, but we are not sure what.
The fact you relapsed after discontinuing seroquel is not a good sign. I would also not let a primary care physician make that decision -- you REALLY need a specialist. Slowly reducing Olanzapine may help find the minmial effective dose, but it is a high risk thing to do on your own.
Seeing a Naturopath is against all known science and the suggestions being made by him/her are weak -- just good basic health.
Since you are a student, I assume you are somewhere between late teens - mid-to-late 20's. (sorry, just saw your age...) This is the time of life these symptoms usually .appear, making careful monitoring more important since your risk of relapse is very high. Avoiding hospitalization and getting a good diagnosis (which you don't yet have) should be your priority. Sadly weight gain and a "foggy, hard to concentrate" state are common side effects of these medications. Being in hospital is a "side effect" of not taking them. The weight gain is very hard to combat
The order in which to do things is to find a PSYCHIATRIST to treat you. After that, they can help find a medication with the least side effects and the minimal dosage.
These things are hard to accept as many people have them "come out of no-where" and must suddenly deal with a new and horrible mental state. There are numerous possibilities for you, none of which I can recommend specifically excepy you need a specialist and dumt the naturopath.
I am online less often than usual these days, so please be patient if you want a reply.
Okay. I suppose I'll keep exercising (to combat the weight gain) and start looking for a psychiatrist. Thank you for your time.