you seem to have a clear understanding of whats wrong and may get more help by contacting the psychiatric ward of a hospital
contact charities, explain your situation and ask for help,financial assistance and someone to go with you to doctor or hospital would probably be a help
tell doc you have no money as they often give out free meds, sample packs, starter packs, etc
it will help a bit if you relax your muscles and breathe deep and slow
toprol being a beta blocker also reduces the physical problems from anxiety