C1-C2 joint injections, anyone?

I have constant headache and neck pain for the last 5 years. After I was diagnosed with a GI bleed, I was a taken off anti-inflammatories and now taking 3g of Tylenol a day to help control the pain and it's not working.

My pain doctor for the first time injected C1-C2 joint on Saturday and although I still have a slight headache, it feels less intense.

Has anyone else had these injections? Did it work for you?