Hi hope65,
When I took a short course of Doxy, my teeth turned black and part of my tongue. You are correct when you said this is caused by antibiotics. When I stopped the Doxy everything returned back to normal.
I know you don't want to stop taking abx and that's your choice. But did you ever take the time to think that if abx are doing this to your tongue, what about the rest of your body that you can not see? Such as your organs, etc.?
Again, this is all about choices.
I wish you the best,
Denise