Spine Injections

On May 17 I'm going to in to have some pain meds injected at L3 and L4 both sides for the chronic pain I have. It radiates in my lower back and thru my right hip and goes down to my knee.
Of course the Dr. does not know if it will work or not or how long it will last. Since a surgery is not gonna happen, I,m trying this to get off the pain meds.
I know there's a lot of you that have the same condition and have gone thru it. Of course everybody is different but could you let me know what to expect.
You can private message me if you like so you don't have to make your medical info public.