Really sorry to hear that Jen. The abx are a temporary fix in my experience. In terms of your gut, dannybex recommended a great site to me which discusses which probiotics do and don't help, and why. You may already be very knowledgeable on this, but just in case, it was
cfsremission.wordpress.com
Sarah Myhill's website site has a good page on the gut as well, just google drmyhill and it will come up. I found olive leaf extract helpful for in beating back the thrush extra.
Also, have you been tested for parasites? I think their presence worsens some people's reactions to antibiotics. Also, if you get the metametrix test you can get a picture of what the impact of the doxy has been on your gut in terms of different bacterial colonies. There' s parasite forum that discusses different tests, type in pptu parasite forum and google it, and it will come up. Good quality aloe vera juice might help. Do you take sacc boulardi? Some people find it helps. In terms of the cystitis, I had many many years of it, but it improved with d mannose dramatically. I also found a herbal tincture in Rinzai's in Sedona for urinary tract infections that helped a lot - I notice you are in AZ. He will send stuff and you can order over the phone as well. I don't know anything about tinnitus, what a rotten symptom to get stuck with.
And did you get much support from the doc on this?
pd I don't know why this is all in bold font. Sorry...