First off, many of the details you cited are inaccurate. However, its pointless to argue over such things. I was not aware of your health condition, but given the pattern of treatment given to me and a handful of others, I was left to assume you were acting as usual. Anyway, my post was to make you aware of a few other reasons as to why you received a low evaluation score. Blaming the students wholly is unjust and there are a plethora of other reasons as to why they may have viewed you in a bad light, as I've elucidated a few already. Thanks for your response and best of luck handling this issue in the coming terms.