I had a problem with foamies for a short time post-RNY (2 to 4 months) -- but it was almost always related to my eating too quickly or not chewing well enough --- dense foods.
If you are getting the foamies after drinking and with medication, I would definitely let your surgeon/doctor know. That doesn't seem right to me at all.
"What you eat in private, you wear in public." ----- Kat