is this agoraphobia?

I'm 21 and have been in and out of psychiatric hospitals for the past 4 years for borderline personality disorder.
Over the past few months though i have developed an extreme fear of being outside, or seeing anybody. The only place i feel comfortable is in my house, i do go outside to go to the shops now and again, but it is usually when i have had a drink, which i know isnt helping, or when i can get my friend to come with me. i have missed 2 psychiatrist appointments and have even stopped picking my medication from the chemist. I feel completely abandoned by the whole mental health service as my CPN is supposed to visit me every week and i have not seen her for 5 weeks, I feel as if i am deteriorating badly and have no-one to turn to. I am getting irrtated by my own existence and that of everyone else and feel like i need to shut myself away from the world. I'm relying on people more and more to just do things like going to the shops for a pint of milk, i feel so bad for this but i just cant face being around people at the moment, what is this? im so confused right now

I have no idea what it is either but I can totally relate to everything you just said. Its as though the second I step outside I feel like people are judging me, looking at me, and I am afraid to make eye contact. As though if I do they can see into my soul, and see that I am not well. I also feel like all of my negative self devaluation gets amplified when I leave the house. I become ten-fold more self-conscious/aware and my negative thoughts about myself become unbearable. I am not diagnosed with BPD but I am 99% sure that I suffer from it as well. I have a history of mental illness, depression, adhd, eating disorders and the list goes on and on. I just recently moved to the UK from the states and I too am beginning to get supremely frustrated with the (lack of) Mental Health care support. I have been to the hospital, trying to get in touch with my psychiatrist, but they keep bouncing me around and I am quickly losing my hope. Hang in there, you are not alone!