yes, i know what this is...........had it many times myself............sinus stuff does not cause ibs problems, un-balanced digestive juices causes sinus issues........part of the digestive process is the production of histamine........gastrin, histamine & hydrochloric acid (HCl)...........it's a loop.........when there isn't enough HCl in the stomach to breakdown food or to keep the stomach at the low Ph it needs, histamine or gastrin or both, gets over-produced........it can make u feel like u r having a full blown sinus attack or just a slight problem........now when this happens, if i haven't taken any HCl in awhile, i take some of that or if i have taken some recently i take anywhere from 150-250mgs of potassium bi-carbonate.........for me, that kind works the best..........when i do, it stops all sinus issues within about 10min.........it's pretty fast.........also, if ur system over-produces gastrin, it can make u feel so awful...........& those who use meds for stopping or reducing stomach acid, r actually doing a very bad disservice to their stomachs & eventually to their whole bodies..........when there is little or no stomach acid, our systems become infested with all sorts of bacteria.........HCl keeps the stomach sterile & kills all sorts of things that otherwise would get into the body thru ingestion or breathing...........when, what people think of as acid reflux, happens, it's actually calling for more HCl, not the reduction of...............i suffered with horrible problems till i found out about this.........i tried betaine hydrochloride, which can b gotten from most vitamin stores & helps ur stomach to produce more HCl, if it's capable of it, before i found out about HCl.........it was such a relief.........one more thing.........when we get too much of the other things, gastrin & or histamine, it causes D in a serious way.........getting enough HCl stops the over production of these things & helps keep us healthy & our livers & kidneys working to remove toxins..........(without enough HCl, u can't get ur minerals completely broken down & into solution, which causes a whole other set of issues)