I use that system from the pharmacy for my 5 year old. i have her do it when she is in the shower after shes been in there a while to kind of let the hot water "release" some sinus pressure. she has to hold her breathe to do it or it goes down her throat & she vomits (TMI i know but I don't know how your gag reflux is & she did this the first few times) we use the thing from the pharmacy though.
prior to having this we used the salt water mixture & I boiled the water & I had one of those things that you use to suck the snot out of babies noses & I sucked water up in that & used that as a rinse----this was not recommended by my doctor when I told him though but it worked just as well to me & it's the only thing I can think of without having to go out & by the Neil Med or the flower pot thing for the sinus rinse.
sorry if I wasn't much help
prior to having this we used the salt water mixture & I boiled the water & I had one of those things that you use to suck the snot out of babies noses & I sucked water up in that & used that as a rinse----this was not recommended by my doctor when I told him though but it worked just as well to me & it's the only thing I can think of without having to go out & by the Neil Med or the flower pot thing for the sinus rinse.
sorry if I wasn't much help