It is nice to know that you have a good medical history. You can take a warm bath with epsom salt to get relief from your symptom. You can also try hot fomentation or use heating pad
in the area where you get the pain. It should get reduced.
In case the symptoms still persist you should consult a doctor and get radiology done to diagnose the problem. You should be clinically examined. Your spine needs to be examined ( L2 and L3 ) since the pain is radiating into the butt area.
You can consult a physiotherapist and get examined. He can suggest you some exercises that will cure your problem. You can use some muscle pain
sprays and take calcium and mineral tablets as dietary supplement. Take care.