I can't say what your doctor might say if you ask. I would certainly discuss any changes with him that you're thinking about first, though.
When I had panic, xanax was the only thing that helped me. I tried ativan and I told the doctor that I could've taken 10 at one time and it wouldn't have helped I don't think. He said that's because it's in slow and out slow. It doesn't have the "impact" to help with anxiety as xanax does. He said it was more for "generalized anxiety". I have no clue, but that's what he said. I do know in my experience, it proved true.
What strength of xanax were you taking? Maybe it wasn't as strong as you need until you get the panic under control.
I feel for you...so much. I used to have daily and crippling panic. After a period of medication to gain some control, then biofeedback therapy, the attacks ended completely. I went off the meds. That was eight years ago and I might have one panic attack a year. I know it's so difficult right now, but know there's hope that it can get better. I'm proof.
Biofeedback was awesome for my panic. Can you check into that in your area?
Good luck and welcome to PC!
KD