Hi there.Thank you for your question.I will be helping you out with your concerns today.I am sorry to hear about your problem.
There is no interaction between gaviscon and doxycycline.
I confirmed by double checking the literature.
So I would not worry whatsoever.
This session is open for any further questions that you may have. I would appreciate it if you rate me by clicking on one of the rating options at your end on the top right hand corner as that is the only way we, the experts, are credited on here for helping you out.Kindest regards
You do not need to do anything.
The official interaction checker that I used did not show any interaction.
The antibiotic would work just fine.