Ezz - I just asked the GP about this this morning, coz I'm dreading having the sinus headaches I had last time. The only relief I got was a cold washer on my face all night.

But the doc said that I can use Polaramine (it's an antihistamine), it's category A (safe in pg) and also rhinocort nasal spray, also category A. I didn't realise these had been categorised! She looked it up while I was there.. she also checked for breastfeeding too for me.

She recommended Fess as preventative rather than for curing an existing problem. She said once I sort out the pains in my sinuses then to clean them out regularly with Fess to prevent build up and infection.

Hope some of that helps.