I am having the same situation. Changing jobs and I'm all worried about loads of things. It happened when I got my first job so, from experience, I'd say when you get into the job, it will settle down.
I get shaky, feel sick (I throw up a lot when having an anxiety attack) and can't breathe too. So yeah, I think you have anxiety attacks.
From my research people have said beta-blockers have helped and I'm currently looking into being put on them cause I hate the physical symptoms.
Good luck to you and there is help available either from me, other people on this post or professional help.
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