Doxycycline Hyclate Medication for Anxiety, Empty Stomach, Pain Medication, Uncommon Problem, Doxy

So glad I found this web page! I just finished a 10-day course of Doxycycline 100 mg. twice a day, prescribed by my oral surgeon after a tooth extraction. Around Day 5 or 6 I started getting heartburn that was not easy to get rid of. At the time I did not suspect the Doxy, because I was also taking pain medication, and thought that was the cause. It just occurred to me yesterday that the Doxy might be the problem. I looked on Drugs.com and read up on it, but nowhere in the listed side effects does it mention heartburn, or any of the mood disorders that other people here have experienced. Luckily I finished the pills earlier today, but I have had the heartburn non-stop ever since. So this time I Googled "Doxycycline heartburn", and I got plenty of results. So, it's not an isolated case. The instructions on my pill bottle were to "take it on an empty stomach", and to "not take any antacids, dairy products or iron within 2 hours of taking this drug". It makes me angry that this possibility of severe heartburn is not listed as a possible side effect of this drug. I'm glad I didn't get any mood disorder problems from it, I already take medication for anxiety/depression. Thanks for letting me vent! I'll be telling my pharmacist about this not-uncommon problem.