I can't think of anything that would help one of those neurotransmitters without affecting another. You may want to research NAC or another glutamate lowering supplement. It does have dopamine effects too I believe.

Thanks for thinking of me.

I'm hanging in there. Things have been extremely rough. I started to make some improvements at this time last month but pushed it too hard trying to feel normal and then slid down again. I'm still alive and moving forward and hope to report some significant progress soon. Meditation and Buddhist teachings, along with the support of friends have saved me.