I wish I had some advice to give you. I've been dealing with anxiety and panic too, and although I've been getting better over the last three years I'm still on Buspar and still taking lorazepam as needed (several times a month). Accepting that I'll probably never be panic free has helped to alleviate some of the frustration and guilt I feel about it and I think that's help with my general anxiety. I did see a counselor and tried some CBT and that did help, so it is worth a try. I haven't tried pot since I've heard that in the long run it can actually cause more anxiety.
Best wishes. If you do try CBT, would you please let us know how it works out for you?