I'm on day one of withdrawal and it was super scary going for awhile there. Until you can see your doctor, practice deep breathing and look up some relaxation exercises online.
If you can get your doc to prescribe a benzo, that will help a great deal. I use them sparingly and finally caved and took .5 of Alprazolam today (I have a small supply due to an ongoing panic disorder). I will probably do that for the next three days if necessary. As well as go see my doc and explain why I have gone through more than normal.
Good luck to you. You can get through this. Please follow up when you can!