Doxy and indigestion

I am taking doxy until I can see the LLMD on the third of Feb.  I started it about a month ago and am starting to get indigestion.  Last time I could tolerate it for two months until I got really bad acid reflux.  I eat when I take it - in fact I stuff myself, I am so parnoid.  I also do not lay down for an hour afterward.  I think apple cider vinegar helps some.  I just remembered that.  Is there anything else I can try?