Read the school policies on illness and the procedures stated in the literature about this. If they followed it, not much you can do. If they did not follow it, then you can hire an Educational Rights attorney.
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Re the issues of grades and transferrable credits: Your school has an in-place administrative grievance process that applies to these issues and you are required to use that process before claiming any rights to bring a legal action. Act quickly to utilize the admin process. Time windows can be very narrow and you may forfeit your rights to any remedy if you do not meet the process time limits.
Re the issue of fees: Of course you can wait to be sued for any unpaid tuition bills. But be careful wrangling with a university about disputed fees. Colleges and universities typically engage in the ultimate self-help against persons with fee disputes: embargo of your transcript.
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It is not clear what you would be suing them over, they usually have the right to charge you for courses you do not complete, unless you drop a course within a withdraw period. if it is a public university, what is at issue is did they follow any administrative requirements, or did you, and if it is a private university, it is a question of contract law. My guess is that this is a private university you are attending, and unless you can prove they breached a contract with you, you will not have a case.
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