Hi AllisonJane - I was dx'd with PsA 2 years ago (after many years of an incorrect diagnosis) and have an ongoing probewith vertigo. About 20 years ago, I had it nonstop for 3.5 months. I would even wake up at night with the room spinning. I also have a low resting heart rate (48 at my last ECG) and I've started wondering if that could also be causing the dizziness. I'm having a PsA flare now and have also been having more frequent vertigo, so I've wondered if the PsA and vertigo are related. Meclizine can help with the dizziness, but it makes me comatose. I'd rather be dizzy than unable to keep my eyes open for more than 5 minutes. I did physical therapy a few times for it and that did seem to help. Ask your doctor for a PT referral so see if that might help. With PT, the therapist will help you figure out what your triggers are and how to avoid them or how to deal with them. I found it useful.
Good luck! It's hard to explain to someone who hasn't suffered from vertigo how scary and disorienting it can be.