I was hired for second shift and told only second shifters fill in for second shifters if someone calls off when I was hired. Work has changed the policy that now that anyone can be called in for whichever shift, 1st, 2nd, or 3rd, if someone calls off. My training period is still going on so that I am on days now until when I do not know when I will be put on my shift and this policy will actually kick in for me; however, I am concerned.

I have been managing my BP for years now, FINALLY after years of failed attempts, by being a a regimented schedule including needed to sleep so many hours at night thanks to my meds. I worked 3rd shift at one point and it made me manic years ago; that is also how I got through it because of the insomnia, I was up. I cannot go back to that because the rest of my life fell apart.

I am considering talking to my docs about getting a medical documentation for a disability indicating that I can cover 1st and 2nd but not 3rd. I don't want to be completely unreasonable and not cover any other shifts. However the problem though is that I am a new hire that is still on probation (in Jan my period ends), also no one knows I have a disability and do not want anyone to know, and it is killing me the thought of asking for this exception being a new hire.

Thinking this through:
If it comes from my pdoc, they will know it is a mental issue even if the pdoc makes it vague just because of his credentials. I thought about talking to and asking my GP for documentation but I have never talked to him about my BP as this GP is new to me and I have only seem him 3 times. He knows the diagnosis but does not know the history. It would be ideal if came from him just indicating a "medical condition" or some wording to that affect.

1. Should I just try to find a way to do the shift and see what happens that I am overreacting so no one continues to know I about my MH issue (but could risk the job due to being unstable); OR
2. Should I talk to my docs and risk this job by revealing the disability and possibly that I have a mental health issue? AND
3. If you did get documentation, would you present it now or wait until after the probation period ends for actual hiring confirmed?

So, what would you do?

Thanks in advance for your feedback!