Hi Fibroprof,
achievinggrace is spot on. I totally agree. Meds do need to be changed up for healing to continue.
I was on low dose Doxy same as you and it did not work for me. I got better for a while then had a bad relapse-- was worse than ever!
I'm not a doctor-- but IMHO-- 10 months seems like an awfully long time to be on one med alone. And Doxy does not work 100% for certain people. It sometimes is not absorbed properly and you can just level off on it and symtoms can come back.
Have you had your SED rate checked? I think this is the test for RA ??? I think so...but I'm not 100% sure.
I would follow achievinggrace's advice and go see an LLMD. This will get you on the right track for sure!