I don't recall what meds you are on, but I know one antibiotic I take has potential serious tendon problems as a symptom. The med is "Factive." You may want to consult your doc/pharm. to make sure it's not a medication issue.
(I've not experience any problems with Factive myself. To the contrary, it has really improved my condition.)
I have chronic tendonitis in different areas. I take OTC NSAIDS only. I'm not sure if they really help much. I only take them when it's really bad.
I don't have a lot of body pain that I can't ignore, but my own choice would be Tylenol instead of Aleve (which is an NSAID, an anti-inflammatory) because I'm not sure how the inflammatory part of Lyme and coinfections interacts with NSAIDs -- perhaps someone else here can comment. I read something about it the other day but it didn't stick in my brain. (Fog!)