Hi. I think the urge to pee is common with anxiety. I get it too when I'm nervous. Especially when I feel like I won't be able to go easily (like when getting on a bus). However, since you've started a new medication, that can be a side effect to some meds. Can you ask your doctor about that? I'm assuming the antipsychotic is or the psychotic episodes you had and hallucinations. Glad you are treating that. If I go to the bathroom before the event where I will have the urge to go takes place, I know my bladder is not truly full. So this gives me the confidence to talk myself through it. And once I get going into the activity or event, I kind of forget about the urge. Talk to your doctor about this though as it is become overwhelming to you. Let us know how it goes!
This is confusing -- you aren't describing psychosis in any way, just an obsessive thought. Since you say you're on anti-psychotic medication, a bit more on your diagnosis would be helpful. The reason is, if you're truly psychotic, such as bipolar or schizophrenic, there's really nothing but medication to treat it and you and your psychiatrist have to work to find the right ones. If you're suffering from anxiety that is focused on this one obsession for now, that's a whole other thing.