I'm glad to hear that you are feeling better but I believe you are in the right and your boss is very wrong. I tried to find some things to help you. I hope they do help at least a little.

'Important: If your employer has been threatening to fire you, get legal advice. There are laws that protect you from being fired for certain reasons. For example, you may not be fired for filing a workers compensation claim, or in some cases, for taking time off for illness or the birth or adoption of a child. To find out your rights, call Statewide Legal Services (1-800-453-3320).' - from http://www.larcc.org/

I am young, just out of college, and am looking for my first job so I could be wrong but I don't think someone could fire you for an illness of that nature. It seems like it would only be legal to fire someone if they had an illness that might endanger the lives of the others around the office which yours would not. But, like I said, I don't truly know. Please speak to your lawyer if you have one. She can help you or refer you to someone who can.