You said the antibiotics really messed with your stomach, I have the same problem, then a doctor friend of mine told me to insist on getting the generic version of the various antibiotics prescribed to me, she said the often the name brand versions have fillers, and dyes that can often upset one's stomach, so it was not the antibiotics per say, but the other things in the pill.
Worked for me.
Best of luck!
The pessimist complains about the wind; the optimist expects it to change; the realist adjusts the sails.
William Arthur Ward