It seems to me, and I am not a med person, that you are associating not breathing with food, etc.
500 calories is not enough for an adult and this may also be affecting your anxiety . . . .without proper nutrition, your brain chemistry can get off course . . . okay, so you decided to stay away from dairy and bread . . . . what about other food . . . steamed veggies? steamed fish? Yeah, I know this sounds unappetizing but the point is to get good food into you . . . you don't need to eat 1000 calories at one sitting, but you need to start disassociating food with anxiety with stuffiness . . . . you also need water . . .if you get dehydrated this also affects brain chemistry . . .but why have a 20 oz bottle on your desk? Get a 6 oz juice glass and sip on it throughout the hour . . . take in a tablespoon at a time and then refill it . . . .
Right now, you need to see food as a friend (yeah, I know if you are overweight, this is not good but in this case you need to see food as a friend but not your best buddy) . . . as a friend, food gives you calories to maintain brain chemistry, to maintain muscle mass so you won't feel fatigued, to provide bulk to stop the diarrhea, etc. From experience, I do not know about Paxil but loarepam can have the sleep effect. Way back, I was prescribed 1 mg at night . . . .I would sleep for 8 hours get up and be as dense as a forest for another 8 hours before my brain cleared up . . . I reduced the Lorazapam to .5 (half a tablet) and it worked great . . . now, I only was on it for a week because of a non-anxiety health issue . . . all of this to say is that people react differently to medicine . . .
So, you won't undo your fears, etc. overnight, but bit by bit with a little more food each time, you will be able to maintain your weight loss but also help yourself to recover from the anxiety . . . have you been referred to a professional (other than a family doctor) such as a counselor to help guide you in techniques to manage your issues?
As always please let us know how you are doing . . .take care, KC