I know what you’re going through William. I suffer from IBS (look it up) and I have missed quite a bit of college as well. My attendance was at one point down to 75% (like you) but I have been attending more so as of now I have managed to get it up to 82%.
Not to mention I also get tired A LOT and I go to bed way too late (though I do try to get to bed at a reasonable hour). I am also late for nearly every lesson as well.
I am doing a level 3 ICT course and I am getting assignments and homework thrown at me left, right and centre and I’m just getting bogged down. I’m also in college EVERY day Monday-Friday. I start the week feeling quite fresh but by the end of the week I’m just tired out and need a rest.
I would suggest having a talk with your personal tutor (or tutors) might help.
At my college, I was contacted by the colleges SpLD Teacher / Assessor. We arranged an appointment and she asked me some questions and we had a discussion about what I found difficult and what would make things better eg sitting closer to the tutor etc.
This helped a lot as the information was passed on to all of my tutors. So they now understand why I can’t make it to class on time or if I need time off.
So check if your college has someone like who I mentioned above and try to arrange your appointment.
I also know what you mean when you say that you lack motivation. I am exactly the same so don’t feel alone. In fact my previous tutor was constantly on at me for not being motivated enough, but that was mainly because I didn’t like the work (very practical-based).
Anyway, best of luck and I wish you all the best with your studies.