seroquel and lithium?

I have been on Seroquel for five years and I take up to 3mg of xanax a day for anxiety. I recently have had added stress and a lot of anxiety. My doctor refuses to up my xanax and instead put me back on Lithium 450mg twice a day and then another 450mg added onto that next week...so 600mg Seroquel and 1350mg of Lithium on top of the xanax! I do feel better however I feel there should be another solution for my anxiety than polute my body with sooooo much bipolar meds. Any suggestions?