certainly sounds hellish. I suffer with agoraphobia myself. I have beaten it once before (for over 20 years).
I used a combination of cbt and exposure which as you say havent been effective for you.
I was actually looking at a recent study of the most effective treatments for anxiety just today.
it had psychotherapy/cbt and pregabalin/gabapetin tied at the top. followed by benzos (with a * for temporary) then a bit of a gap to ssris then snris. then trailling last was alternative/complementary.
its just one study but my point is those pretty much ARE all the options.
Exposure therapy is proven to work. its worked for me before. I keep rushing it this time (not small enough steps and too quickly increasing the difficulty).
cbt isn't much to do with not thinking bad thoughts. we can't control our thoughts directly like that. its more to do with relabelling thoughts and our reactions to them. try a different therapist if they just told you to stop thinkiny negative thoughts.
meditation is far from useless too. as a person who has regularly panic attacks ive been just starting to practice mindful meditation for 10-20 minutes a day for 2 weeks and its improved my sleep, given me some relief from anxiety symptoms (almost as good as a drug a few times) and even prevented a panic attack. Im not so good at using it outside yet but early days
anyway hopefully you will find some of that useful.