Unfortunately, bipolar disorder is a questionable issue under the Americans with Disabilities Act (ADA). In order to be considered as a disability under the ADA your condition must affect a major life function. In most cases, work, is not really considered by the courts to be a major life function. Furthermore, with the FAA specific rules and requirements, there may be specific medications that may disqualify anyone from flying. In order to get a more definitive answer you can have your doctor consult with a qualified flight surgeon (yes, I know you are not a pilot, but if medications qualify you to fly a plane then you are qualified to be a flight attendant on the plane).
One suggestion, while you are out without pay for now, send them a written request to be out on Family Medical Leave under FMLA. Then you need to get moving to get the medical information completed because FMLA leave is only 12 weeks.
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