I have been suffering really badly with my sinuses since before I was pregnant... I'm almost 17 weeks and its just getting worse and worse for me. I went to the doctor and he prescribed me something rather non-safe (not going back there again!). I found FESS nasal spray did absolutely nothing for me and since I never got any help from the dr I ended up getting a nasal wash from the chemist. it's not as horrible as you'd think. You basically fill the provided bottle with warm boiled water and mix it up with a saline sachet they give you, put the spout bit in one nostril and squeeze gently. The water will go in one nostril and out the other, then you do the same on the other side. It sounds gross but it really isn't so bad (and I was terrified of doing it).

It does kinda help... my biggest problem though is my post nasal drip and it didn't make any difference with that sadly