I've had a few professors who are just plain old grumpy people that refuse to give personal or human attention to anyone in a class. Once in a small class of 35, and a couple of times in larger 100+ lecture classes. I don't bother with them. It took a little bit of pushing myself, but I went to the school's Student Disability Services Dept, which every school must have (in the US at least) and filled out the papers, spoke with an advisor there, and got my doctor to write something up for them. It's pretty open ended since I don't need special assistance attending class or taking notes, etc. If I have a situation come up, I simply tell the prof afterwards, by email or office hours, that I have an issue on file with the SDS department, and if they need me to, I'd be happy to get a copy of the faculty notice so they can have proof to excuse my tardiness/absence/exam whatever. No discussion if they're the mean type, and they cannot say no, by government and university law. If it's a class that's in a troublesome time of day for me, I'll tell them upfront I have an issue and might be late or missing here and there, and again offer to get a copy of the paper from sds stating such. They never know what my troubles are, and can do very little besides require the form, which is worded vaguely to protect the student's privacy. So, look into that option, or a similar program wherever you are located. It took me some time to get myself to go there, not seeing myself as disabled as others may be, but it helps, I deserve it, and I'm certainly not taking away from funds/facilities that the more needy require.