Hey there
You poor thing!
It is worth checking with your GP what you can take, I had a similar problem and seem to recall being able to take Polaramine and a nasal spray called Rhinocourt. In the end I decided not to take anything like that so I cant remember.
I definitely know those drugs are ok for breastfeeding.
As an alternative have you tried garlic & horseradish tablets? I took those and found they helped a treat. You could also use Fess nasal spray to help ease congestion (its merely saline).
Good luck
Belinda.