cant cope with the panic

hi all glad i found this site i know im not alone. if been taking martazapine for about 3months now and bang my panic attacks are back i dont wont to leave the house again of fear of having a heart attack crazy i no pts just how it makes me feel i dont no what to do im sick of fighting with myself everyday i used to be a happy purson used to work and now now the thought of going out of my front door starts my heart racing :(