demotion due to medical leave and absences

i wanted to inquire as to whether or not i should obtain an attorney. i hold a supervisor position at a major retail corporation and have had several health problems this year. i am a breast cancer survivor of five years and had a couple complications due to my former illness, found fluid on my heart, and developed a panic disorder (post traumatic stress disorder) along with a diagnosis of depression. a major stress factor was not my job, but some of the people at my workplace. anyways... i was disciplined for unapproved absences and was told that the amount of excused absences that i had was unacceptable. furthermore, one of the assistant managers went on to claim that she felt i wasn't mentally healthy enough to hold my position and asked if i wanted to step down. i admitted that i had been physically ill of and on and appologized for my absences, but said that my mental health had been better than it had been since i was a child. (at this time, i had been in psycotherapy for months and had managed to get a hold on my panic attacks and went through hypnotherapy to address some issues from childhood and even adulthood.) just about a week and a half after that i was pulled into the office and demoted due to my absences. what can i do?