Hi keey17 sorry to hear about your dad. I understand your hurt and frustration but I should imagine that he  has himself a mixture of feelings that he is finding hard to process. 

It's very hard to do but try to walk away when he is being snappy or unkind. Don't say anything just walk away, go into the garden and scream or cry what ever it takes. I know how you feel as I nursed my father in-law for 3 months b4 he died. 

I know he didn't mean to be hurtful or unkind. But when you're frightened and hurting yourself you sometimes lash out at the people closest to you. 

Get help from local groups to give yourself a break. If you get tired or to stressed your not gonna be any good to either of you. 

Register at your GP as primary carer and they will be able to provide you with help and  numbers of groups that can help. 

Always willing to listen xxxx