I feel for you and understand. I too have had some relapses/flare-ups. I alway think they are going to be long term and last forever, but they don't. After 3+ years of complete recovery, I relapsed after a very stressful event in my life. I was sick for about
6 months which was a long time to me then. I got better and then found out I was pregnant about
a year later. After I had my daughter, I relapsed 6 months later. That lasted a little while (I never took abx again. I feared I would get worse if I didn't, but I just don't have it in me to take them anymore). I got better again and recently had a miscarriage back in May and boy did I have a flare-up. I was sick sick sick, but it lasted about
a month and got better again. I am now doing well and exercising every other day which for me is better than any abx I could take in terms of healing and keeping me well.
Who knows what tomorrow will bring, but it seems to be a normal way of life for me now to know that these flare-ups are going to happen here and there, but they do always pass. It's good you are back on treatment and hopefully you can nip it in the bud before you feel any worse.
I never had "pain" like you describe with lyme, mine is more neuro, but it sounds like you have a good dr. and I hope you start feeling better soon.