Be very careful who you share confidential mental health information with at work. Very often it comes back to haunt you. Once someone in your office knows they can find ways to use the information to further undermine your work situation. Have a long talk with your psychiatrist. If he decides an FMLA is in your best interests, he's the guy who does the paperwork. He also has the clout should a legal issue immerge. My employer tortured me for 4 years in hopes I'd quit and they wouldn't have to pay unemployment. The harassment was so severe I needed an attorney's intervention.

Proceed very cautiously. Talk to your psychiatrist. Work out a work strategy with him. Then approach HR, not your supervisor or coworkers. HR has at least the legal obligation of confidentiality. That doesn't mean they don't leak however.