Hi I used the AlphaStim about 6 years ago for severe panic disorder. I found it made me a lot worse before it made me better - the doctor who designed it said they found a small percentage of people reacted badly to it (typical that I'd fall into that small percentage). I was doing various other therapies at the same time (TFT, meditation etc) so can't say which of the therapies did the trick for me - but over the following few months my panic disorder resolved (this is after 12 years of trying every therapy under the sun and being terrified of many situations which really restricted my life).
I think they offer a 90day money back guarantee for it - so would probably be worth a look.