So this all started for me at the beginning of the current school semester.  I'm in a kinesiology course that requires knowledge of high school physics and calculus, and being that I did well in those two subjects in high school, I'm cruising through the course.  Meanwhile, there's a classmate of mine who is struggling a lot in the course (lets call this person anon).  anon is also a co-worker at my workplace, so there's somewhat of a connection.  Seeing that I was doing really well, anon asked me to help him out with some problems at the beginning of the course.  I didn't really find any problems with that, so I helped anon out with some homework for the course.  

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Fast forward to present day, and anon has asked me EVERY WEEK since the beginning of the course for help on homework and labs for this course.  I've been helping anon quite a bit at this point, but at this point I feel pissed off that anon repeatedly asks me.  Anon has told me that anon forgot everything from high school so that's why anon struggles, and I felt compassionate towards that.  However, anon never stops asking.  Recently when anon asked again for help, I wasn't feeling well physically, so I message him that I had a doctor's appointment and that I probably needed to rest for that day.  Anon sees the message and proceeds to ask me when my doctor's appointment is over and whether we can message each other instead to help anon with homework.

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I feel bad for anon because anon is struggling in this course that is mandatory for kinesiology.  Also, I feel like I should help anon because anon is kinda friendly at work.  Yet, I just really want to go up to anon and tell anon to fucking stop asking me and go to the prof for office hours instead.  Should I though?  And AITA?

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tl;dr classmate / co-worker repeatedly asks me for help on homework for a course, even when I'm not feeling well and I tell him no basically.  And at this point im pissed off at this person.