I Have Been On Cymbalta 60 Mg For 8 Years,

I have been on Cymbalta 60 mg for 8 years, I started feeling more depressed so he added 150 mg Wellbutrin for a week then told me to start taking a 300 mg tab. I'm sure that's ok
but he also started me on 25 mg of Seroquel at night is this safe my speech is slurry and I just feel weird and my balance is off