I used to get a very effective Rx med, it was produced in a green & white capsule, had several names over the years - bromfed, bromfenex, bromthis or that. Great antihistimine, one pill would clear blocked sinuses for 12 hours, allowing clear breathing to sleep. I have asthma and allergies. Thanks to the dopers it was discontinued. Have never found anything else that works so well.
I've heard of this But Now I KNOW why My V A can't prescribe it!

Even on O2 and the CPAP I STILL git very congested! I go through a LOT of wally wurld saline nose solution! Dumb azz druggies spoil ANYTHING and EVERYTHING some folks Actually NEED!

Sometimes the Peppermint Altoids help with the congestion. RIDE SAFE.