2 questions: Is 10 weeks too soon to get botox again? Will insurance cover the botox since it helped with chronic pain?

Have had a headache/pressure between my brows. Dr treated for a sinus infection. After a couple rounds of antibiotics and steroids with no relief, I got a CT scan. It came back showing no issues. I have a herniated disc and a lot of inflammation in my neck. Only explanation i have been given was that it must be some kind of nerve issue.Then there was a miracle! I got botox injections for the lines between my brows. My headache was gone! The headache and pressure come back after about 10 weeks.