@harleysmom79 ahhhh mattresses! I had bursitis long before my hip went downhill, or so said my PCP "probably". If that was the case then, I have it in spades now, more so on the left.
Anyway, before it showed up, we'd bought a flotation system bed (fancy name for a water bed that doesn't slosh). I looooved it, and had it for decades. In 2014 we moved to a rental house which didn't allow them. I switched to a regular old Coleman or Aerobed 9"-12" air mattress, because I use one happily at the vacation house. I thought to put a 1-2" piece of memory foam on it in the winter, to stay warm, and that's where I've been for the past 6 years. There is not a mattress on this earth that I would find more comfortable. Granted, that is not to everyone's taste, and is a large accommodation, but when I'm awake at night I'm in less pain.
So you might try 1-2" of plain old memory foam, no gel. Gel gets hard right where you put your weight, and I don't understand its appeal. I get mine at Amazon. There are many choices, none terribly expensive in twin size. I put mine right on top of the mattress, and make the bed up as usual after that.
Good luck, and hang in there until you go for the THR!