Your right there Spectre, it's a terrible cycle were you just constantly take stuff for relief but your adding to the problem.
I normally end up just going without meds till the sinuses settle but this time nothings working
I noticed mine being worse in the last few days, but thought it was what I was eating.
Maybe some tree or mould likes giving off spores at the moment?
Try the Oxymetazoline if you haven't already. I use the Galpharm one, it's not expensive. Quite slow to act but lasts a while.