You should speak to your university about this, most have a wellbeing team who can help provide you with some support during this time.
You could always defer a year to give yourself a year to grieve, but thats a conversation you should have with someone like your tutor, as they will be able to advise you on the best course of action.
I am truly sorry for your loss, its understandable that workload on top of what you are going through is feeling unmanageable. I really hope you get the support you need and deserve.