I understand about not being able to block out the pain to sleep. I can usually distract myself enough to make it bearable with medication during the day but nights suck. I have no words of wisdom for you. I don't take sleep meds every night but if it's been over 4 or 5 days without sleep and my body refuses to crater, I will. Eventually, my body does crater and I sleep. It's a hard way to live but that's life with chronic pain.
All I CAN suggest is to talk to your primary care provider about your dietary nourishment and vitamin intake. Have them check your B12, Vitamin D, B, and all the levels that reflect your energy and dietary requirements. Make sure you are getting all you need. Sleep is when the body heals and replenishes what it needs and when we don't sleep, our body and mind suffer. The body breaks down in more ways than merely being fatigued. That's why we get grumpy, don't feel like eating, and eventually end up sick with colds, the flu, and much, much worse.
Battle it on more that just one front (diet, rest, exercise if possible), and you may be surprised how much better you feel.