[Am only sharing my experience here]
I have had this for 8 years now.
Doctors gave me Lyrica then Later Gabapentin (those medicines don't seem to help that much).
Physiotherapy Helped a lot. My condition is 70% better than what it was initially. But it's stagnant at that. If I don't go for my Physiotherapy Sessions for a week, the symptoms are back again. I too keep Muscle Relaxant and Zerodol as SOS.
Vitamin D3 + K2 7 + Calium, B12, Iron + Calium combo helps a bit in Pain & Tiredness respectively.
Manual Physiotherapy Sessions + IFT is what they give me every alternate day. (That way my condition is Stable).
Specific Isometric Exercises may help.
Any diet which helps in this is not known. Only adviced to have higher protein diets by my Physio.
Lifestyle - You need to avoid lifting heavy weights from the side which has pain.