<human>: Can you give me a shortened version of the text?

I am starting a new job next week after 4 months of nothing. 
Along with my own job searching, I was also with an staffing agency who eventually placed me at this big corporation, but this was a"long-term" placement.

A lot of my onerousness about this new job is that I have been fired before (who hasn't) and many times I felt it wrongful. Now I have this huge fear I'm gonna be fired at every job. 

And, I feel inexperienced at this large corporation.I've really only had an internship and a student job. I think I got hired because my portfolio is good. 

Technically, the environment should be similar to my internship because it is in a laid back dept, but they also said the onboarding is ridiculous. My job isn't technical and is in the creative dept, so I have no idea what this could entail.

Also, I was diagnosed with a chronic pain disease recently, so I have to request off at the end of my first month for a dr's appt since I am trying out a new med. I am pretty much terrified of even bringing it up. Especially since I am technically through the staffing place.

 This disease also puts a HUGE limitation of food/drink I can have. I think it kind of alienated me at my internship from the other interns, who were ultimately assholes anyways for judging me about something I can't control. But this left me feeling bummed. I pretty much can't eat anything without reading ingredients, and I know this corp throws a lot of parties.

Anyways, any advice for these topics?
<bot>: first real job, scared and nervous, fired before from other jobs, need to request off early for drs apt, feeling insecure about disease