Until you get your new mattress, here's a couple things you might try.
Can you flip your mattress? I flipped mine a bout 3 years ago and it helped a lot. If you can't flip it, can you change the direction or side from where you're sleeping? Maybe some parts of the mattress aren't as bumpy.
I started putting lavender oil on my pillow. I get a dollar bottle at Dollar General. It has really helped.
Two weeks ago, I started sleep on top of my covers and use a sleeping bag as a cover. I am sleeping better since I started doing that.
I dampen a towel and hang it on a clip hanger on an over the door hanger. The water evaporates overnight and keeps me from getting dry mouth.
I have a box fan blowing on me. I recently got the ceiling fan in my room replaced, and love having the extra air flow.
Did you ever think about getting a piece of memory foam and laying it over your existing mattress? That helped us a few times in the past.
Those are some of the successful things I've tried. Good luck on sleeping. Heard a line from an old song, "Don't wake her up. Sleep is the only freedom she has."