Dont give up. There is a huge difference in how doctors do nerve blocks. My husband developed migraines from a concussion and went to a doctor that did nerve blocks and no help. Went to another pain management specialist and he did nerve block and his headache was immediately gone for a couple of months with occasional flare ups. Three months we had another nerve block done and he rarely has headaches any more. Find a pain management anesthesiologist rather than a neurologist. They are special trained in nerve blocks and radio frequency and have greater success rates. There is an amazing doctor in Fresno ca for those that live in this area.