Glad you're getting the sleep thing under control. Had a bit of trouble with that a while back, adjusted fluid intake and made some black curtains for the window.
As to the other 'issues' of being 70. The 2 systems that are still going strong are my hearing and smell, everything else seems to be going downhill at an alarming rate,lol.
The sinus thing, have you tried acupressure/acupuncture? There's a spot in that little bowl just above the earlobe but before you get to the ear canal - it's between the ear canal and the ridge above the lobe. If you use you finger nail and just poke around or massage that area, you may feel a sort of prick, if you do that is the spot to focus on and then just 'work' a bit with your nail.
I use to get sinus infections on regular basis but then I found this doctor that had gone beyond medical training and also studied acupuncture. It was about 30 years ago now, well one Friday I woke up with a really bad sinus 'thing', allergies would trigger me terribly. He was able get me in and he was not sure if it was an infection. He put a little pin thingy in my ear (the spot I described earlier) held in place with a bit of medical type tape, with instructions to massage the area every few hours. He also wrote me a prescription for an antibiotic with the instructions to take the meds if I was not feeling any relief within 24 hours. Be the next morning my sinuses were clear and feeling really great. I continue to use the this technique, I don't use a pin to find the spot, just my nail, and then I massage it throughout the day.
Sometimes I use magnets, the sort you find on a clasp for a necklace. I found the magnet clasps on beaded necklaces at yard sales and the thrift store. I took the beads off and put a short cotton string on the ends. One magnet goes in the little bowl in the ear and the other on the outside behind the one on the inside. It really does works to unplug my sinuses.

I have hearing enhancers (under $100) that I use to watch TV sometimes as I have trouble pulling speech out of the background music without them. But I can’t wear them on a regular basis, can’t stand all the racket! I kind of like my quieter world.