Elbow pain. Anyone else have this?

I have been suffering from elbow pain or as the doctor I saw in September put in “ulna nerve syndrome.” It makes it hard to sleep, hard to reach things, and even hold things from time to time. I can go the entire day feeling good. Then bed time comes and pain comes. Any suggestions on how to sleep at night with this pain?
Doctor suggested a splint. Have not received the script.

Is there a website to go and purchase one? Is it worth it? Or am I wasting my time?