just wanted to chime in that I hate Doxy too, maybe not for the same reasons as you. I have a LOT of heartburn, and it seems that upon learning I could have no dairy products 2 hrs before or 2 hrs prior -- well, that caused me heartburn just looking at those big, ugly bottles of nasty pills!
It was prescribed to me by an LLMD -- on the very day that I saw him (first visit), I got another tick and called in a panic. So since he had only just ordered lab tests, and so hadn't prescribed anything yet, he called in Doxy as a prev for Rocky Mt spotted fever.
Fortunately, before that (doxy) script was done, my test results indicated Lyme and we no longer felt RMSF was a concern, so he put me on Amox.
But I am here to tell you that the Amox caused HORRIBLE anxiety and unbearable depression. I did not know if this was herxing or caused by the Amox, but did note that depression was a possible side effect of Amox. I completed 2 mo. of it and felt a lot of relief when that was over.
Having problems again, but I do not yet know if it's because the lyme is back, or a co-infection didn't get knocked out (positive for Babs), or if I am left w/ issues from having had Lyme. That will be another post.
Just wanted to sympathize w/ you -- I have never in my life had a problem w/ any abx, but something about that Doxy seemed to make me sick just looking at it!