Even if you never got a SIBO diagnosis, look into the mBiota elemental diet course they offer. 2 weeks of it has been proven to normalize the gut microbiome for SIBO patients (methane & hydrogen).

I also had a very negative reaction to ciprofloxacin and later moxifloxacin (I took them for different infections). In any case, I haven’t suffered tendon issues just neurological effects (hard to describe how my cognition changed but I was simply unable to sleep for several days until I stopped the medication prematurely).