I think that if you have severe anxiety that causes a rise in stress hormones in the body and will certainly affect how the brain chemical balance is like. Even if you don't have anxiety attacks symptoms such as over active thoughts, obsessive thoughts, and mood swings are all due to chemical imbalances. Without knowing the exact nature of your imbalances the best thing to do is to eat healthy, excercise vigorously, and start taking doses of high quality fish oil to try to let your body best balance itself out. If after a year or two of this and you don't see improvement you can maybe try one of those Amen clinic brain scan centers to see which area's of your brain or over or underactive. That is if you can afford it.