I am totally, completely in your situation right now!!!
New job, just like you. Have quit jobs before because of anxiety or just not being able to deal with the BS or pressure that came with them. For years I took the easy, crappy $10/hr jobs even though I have a Master's degree because I just couldn't deal. In this society it's almost like you have to be on meds to deal with any kind of "real job" beacuse they are all high-stress, performance based things and that is poison to us. Right now my probation period is about to end at my job of marketing coordinator, and I am about to get a pay raise and all the bennies. I answer directly to the owner of the company and there is a lot of responsibility with this position. So it's like my whole FUTURE is riding on this one job right now. It will be the most money I've ever made and I am scared to death of screwing it up. I too was doing OK with my anxiety until this job came along. My symptoms started going through the roof about a week into the job, and I almost quit. But I've been pushing through it one day at a time and I am determined not to let this beast get the best of me.
IMO, anxiety has a lot to do with repressing your true feelings, many of which relate to anger and frustration. But when one is in a brand new job one cannot just let it all hang out, one has to be on one's best behavior 24/7. Well that never sat right with me and I relized lately that it's causing a lot of my current problems. So I just decided yesterday to let myself get good and ticked off, let fly with opinions about things that were frustrating me, and I felt a whole lot better. I also let myself get mad at the anxiety, I went into fighting mode and I'm like "you're not gonna get me, I am the one in control here, I need this job and I 'm gonna keep it in spite of you!" So I stomped around all day yesterday taking deep breaths and voicing my opinions. And I had a MUCH better day than I've had all week. It's amazing what happens when you simply assert yourself and remember to breathe deeply.
I'm not suggesting you tell your boss to go f- himself or anything, but do express your needs and what you're feeling while you're at work. You can do so in a productive way. It's called assertive behavior, and it feels good once you get the hang of it and realize that you're not going to be punished for having an opinion. And meantime if you need meds to get you over the "hump" well then do what you have to. I take a little extra Propranolol when I know there's going to be a freaky day coming up. No shame in that. You can always go off it later. Would you NOT take aspirin when you have a fever because you're ashamed to take medicine? Of course not. You take the meds to treat the symptoms as they come along.
You're right in that you can't hide in the house for the rest of your life. That is a bad feeling and crushes your self-esteem. Look at this as a challenge and a growth opportunity. IMO things happen for a reason, so maybe this situation was meant to teach you something. Just think, if you can get past this rough patch, what kind of successes will be next in your life? Maybe in 5 years you will own your own business and not have to deal with jobs anymore at all. That's what I'm trying to think of for myself, anyway. It's a pipe dream but it helps to have something to look forward to.
Man I love this board, I'm psyching myself up right now with all this good advice LOL! It's like having an anxiety journal that talks back to you. Anyway, you are NOT alone in this one, and I am so glad you wrote because now I feel that I'm not alone in my situation either!