I was diagnosed with Bipolar II after rapid cycling on anti-depressants. The first few months are particulary challenging as you not only start new meds, but transition off the old. I'm not sure which is worse!
Lockdowns definitely add a layer of new stress and prevent many of our usual routine activities that keep us on track. My old psychiatrist use to say that you have to think about your wellbeing as a chair with four legs for support - one is exercise, one is sleeping, one is a healthy diet, and the last is taking your medication while staying away from alcohol and ilicit drugs. Fortunately, we can at least manage most of these under the restrictions.
Hope you're taking good care of yourself and if you don't have a psychiatrist in addition to your GP and psychologist, I would very highly recommend you find one. There are also a few good online support groups around if you want to chat to people with similar experiences.