Chew gum as often as you can - the motion of the jaw helps the ear tubes to drain properly (this is something that helps kids with glue ear, too). ETA - and wiggling your jaw from side to side will help as well.

There is another saline rinse product that I use as well - it's stronger (ie salt's more concentrated) and its in a pressurised container so you get a good rinse and not just a squirt like with the Fess. It's called Sinoclear and works much more effectively on "real" sinus congestion. The other thing that works really well with eartube blockages are decongestants (like dimetapp) or the beconase allergy nasal spray - but I have no idea about their safety in pregnancy so you would need to check that out.

For the mouth breathing/dry sore mouth try to sleep on your side (if you can) and think about using a mouthwash like biotene before bed and in the morning to help sooth your mouth. As for hubby, he put that baby there, he can sleep on the couch if the snoring disturbs him LOL.