im sorry to read how everyone is struggling lately.
snowy - hugs.
ed - email your tutor. Explain what is happening - tell them you cant manage to sort uni out while you have the added responsibilities around you mum.
but - your mum is ultimately not your responsibility. She needs to access help, just as you have. You cant care for someone else while you are ill yourself - what input is your mum having? has she seen gp? counselling? CPN?
I think you need to let people know you are struggling with your own stuff just now and that you need help to deal with added stresses around your mums illness. Why are your meds reduced?
i realised today more than any other day that the meds have really had a positive impact for me. I used to be an absolute bag of nerves, i used to hide from the scary stuff, my stomach used to flip when i was called on at work....
now im shouting up for job after job. its just not phasing me. i dealt with my absolute worst fears today - alone. serious accident, and no help available as it went mad on the radio at the exact time - i was actually one my way to another incident...incidents were coming in faster than we could resource them. So i was alone, at the scene of a 60 mph head on collision.
and i coped. inwardly i flapped. it probably came across on the radio.....but i coped. i did what i needed to do. i had 2 ambulances, fire crew, 2 first responders, and a whole lot of backed up traffic on a major arterial road. This was my worst fear to deal with. And i managed it. it may have been a bit cackhanded but i did it. And i learnt from it. It was probably a saving grace that i just happened upon it rather than had time to think about it.
i have had the busiest, most hellish day. and im still here.
i have counselling again this week. i feel like ive turned a corner. im me again, im just me with added courage....god knows whats in these pills but i dont think i want to stop taking them....my stomac
h used to flip at the merest hint of anyone shouting my call sign.....now im throwing myself in.
and finding out what the worst that can happen is........nothing, as one of my colleagues on another group said to me today....whats the worst that can happen? they can put you on a response group....oh - you are on a response group! 
i consoled myself with my cock up that others cocked up too....it was an immediate and live incident with split seconds to make decisions.
i made a wrong decision. hey ho. no one died.
and ill go back and do it all again tomorrow.....hopefully getting my time back as i was very late off.....