I am taking Doxycyline long term and unless I take it first then eat immediately, I get severe heartburn. I have a prescription for Prilosec and think that it might help, but can't coordinate my times to take my meds and eat, etc. Will the Prilosec counteract the Doxycyline if I take it within 1/2 hour after taking it? Is Prilosec considered to be an antacid?