Hi there ~
I understand your concerns. Panic attacks on marijuana are common. I would strongly suggest that you go off of the habit of using marijuana due to planning on undergoing LASIK. I also believe that you need to consult a psychiatrist
due to having symptoms of depression
either due to substance abuse
or due to the fact that you are going to have the surgery. I hope you do so as soon as possible to get on the path to recovery.
I hope this helps. Take care and have a lovely day!