Ask for a Mayo referral to see a sleep specialist.
I was diagnosed with PLMD over one year ago from the Mayo Sleep Specialist, after a number of neurologists said I had Restless Leg Syndrome, known as RLS. I have been living with the PLMD symptoms for over 35 years, with many medications prescribed to no avail.
The medication I use is buprenorphine, and I take at night the smallest dose, about .25 mg. The opiate comes in a 2 mg tablet, easily breakable. It has been lifesaver! I am totally against drugs, but when you cannot sleep, or stay awake for hours, I was willing to take a try. You need to see a dentist, as it promotes tooth decay, due to the tablet sits behind your tongue to dissolve, with brushing your teeth, 30 minutes later. I do go into he dentist fro regular checkups, and as of last month, no cavities.
Good luck to you, and I hope my comment helped.