I'm a retired university lecturer. 

There is nothing in the slightest selfish about your post. You are being extremely sensible coming to grips with this now.  

Every university does it differently, but there should be either a person or a service dedicated to the pastoral and academic care of the students.  Sometimes it's someone called your personal tutor, sometimes it's called student care services.  Also each course should have a named individual, perhaps with the job title of Award Leader or something similar. These are the people you need to see in person to get them on  your side.  

Most of the time, students simply go off the radar and the university then has no idea what's happened to them. The general assumption is that the student has dropped out and the student ends up being chucked off the course, or failing their exams (and then getting chucked off the course).  So if you explain in person what's happening then most people will do their best to help you, within the rules of the university.

I suggest what you need now is to be able to withdraw from the course for the rest of the academic year - if you can do so without academic penalty. You can then restart in September this year, or maybe even September 2020 with a clean sheet. These things can usually be arranged, but you need to be at least engaged in the process of getting it sorted.  There will be implications for the fees, and it will be up to the university to decide what those will be.  You will almost certainly end up having to pay more fees, but I can't predict how much more. 

Finally, there may also be separate provision of student counsellors which you should be able access for free.  They can't help you with the academic ins and outs, but should be able to offer you some form of counselling to help you cope with all that's going on in your life.

Hi I think in your case I would explain to main people at college what's going on and see if you can take courses next year, your head is going to be all over the place. Like you said mom comes first. Hope you get something sorted best wishes. 

Billy