I am sorry to hear that you are being treated badly by your employer. The FMLA has protections in place that prohibit retaliation for employees who are seeking leave pursuant to the FMLA. You should contact an employment attorney in your area. Good luck.
It appears your employer has regularly granted your FMLA leave. It appears your employer's concern is your ability, when at work, to adequately complete your work. If your condition is a disability under the Americans With Disabilities Act or any applicable state discrimination law, the assessment will be whether you can perform the essential functions of your job with or without a reasonable accommodation.
I'm agreeing with the prior advice here. The FMLA is federally-created legislation that has a framework preventing an employer from discriminatory behavior. You would be best served to talk to an employment attorney in your area right away to assess this issue.
Is this “helpful” or a “best” answer? Please mark it if it was, and I hope it was! Thank you! Nancy L. Ballast is an attorney in west Michigan, with a practice centered on family law, estate planning, and criminal law. www.nancyballastlaw.com