Chronic Leg Pain - daily basis (Sickle Cell Patient) Please Help

I have Sickle Cell Anemia and I suffer from chronic leg pain on a daily basis. I have had multiple test done on me MRI's, XRAYS, Catscans, Nerve test, to no avail. This is not a sickle cell crisis. I have been to every doctor in my area none of them have been able to help. As of now I take 10mg Oxycodone every 4 hours. I can walk and accomplish most everyday tasks. But the pain is still there, It never leaves I am begging for answers. The pain is excruciating and I am incapable of going to school anymore. Please if there isn't a solution for my pain then there must be some way to manage it?