I am in a similar situation, but I am going to start a new job and currently in the process of leaving the current job. My anxiety is an all level high. The idea of meeting new people and worried I won't fit in. Worried it will be all too much for me handle a proper full time corporate job, as I've only done part time. Worried that I will be too stressed and will have no social life, as I am also doing a part time masters. It gonna be alot and worried that I won't pass the training. Worried I will miss out on a lot, as I am still very young. I have never had an relationship, so worried I won't have time for anyone. I dread starting the new job and the change. But whatever happens I know its for the best of me. The worst things would happen is that its doesn't work out and leave the job for a career change, or made redudant. I totally understand what your going through, sometimes its just soo painful and I don't even know why its happening, I worry too much.
Sometimes I worry because I have no one to talk to or someone who is always available. (I mean of course I have friends) but its hard when they aren't responsive as I want them to be. Sometimes i worry because I am bored.
It great that your taking therapy, have you thought about going out with friends, maybe a walk in the park, or working out.