Oh poor babes, I get it at least once a year and it is really awful.
I can offer three tips - avoid all meds relating to sinuses except antibiotics - and only then if it's an infection - you'll know from the colour of your (sorry about this) mucus - if it's green, it's infected.
Second, do steam baths as often as you can bear it. Some people use apple cider vinegar in the water, or tea tree oil, but I find they get a bit stingy on the eyes - unless you wear swimming goggles...
Third, I use Sudafed sinus spray before bed - but there's a trick to it. Spray in one nostril, holding the other one closed, sniff once, repeat on the other side - then do NOT sniff again. Breathe through your mouth and in 10 mins or so you will feel it start to clear. Brilliant stuff.
Hope you feel better soon!