Should I sue my employer for discrimination?

I was told that I would be fired if I continued to miss work because of my seizures. They said I needed to use short term disability, although I would have to be fired when I did. They agreed to hire me back at my same pay and benefits if I came back before a certain date with a doctors note. My neurologist said I could return to work as long as I didn’t operate heavy machinery. My employer refused to hire me back because the restriction even though operating heavy machinery was never required for my job. I used to drive forklifts or tractors sometimes to help out, but my only job title was general assembly (which doesn’t require driving anything). My supervisor and plant manager both want me back, but the HR person said no. When I asked why, she said they wouldn’t work with me until I got well. I worked for the company 7 years and only started having seizures 2 years ago. What are my options?