your bipolar may in fact be of dietary origin - neurological or mood disorder is more often a symptom rather than a disease. gluten intolerance, blood sugar dysregulation, omega-3 deficiency, B-vitamin deficiency, any number of toxins, alcohol or drug use (including cannabis), or any combination of these and who knows what else. the increase in side effects could be an indication of your decreased need for the drug. I encourage speaking with your provider about reducing your dose. eventually you may be able to wean completely off.
I've struggled with bipolar intermittently since I was a teenager. it got to the point that I was unable to work and rapidly cycling from intense anxiety and mania to almost suicidal. I tried the drugs, but hated the side effects and am too fond of my liver. it wasn't until I cut out all the sugar and grains, and quit smoking pot, while significantly increasing my dietary fat that the mood swings stopped. now the only time I have mood issues is when I consume alcohol, gluten, or MSG.
I recently read a book I believe will be helpful. the author pushes a plant-based diet and cites things like the China Study, but I just tolerated those parts. the rest of the info is great. it's the UltraMind Solution by Mark Hyman, MD. you should be able to find it at your library.