Hi and welcome. I also am sorry about your Mum, but she's done an amazing thing by donating her body - although I know that doesn't make it any easier for you.
Losing a parent is terrible and if affects every part of your life, so please don't underestimate how much this can be affecting you. Have you spoken to a bereavement counsellor - organisations like CRUSE are amazing.

I agree with Jaq, the best option to access so many therapies is to go via your GP. Go and talk to them and tell them what you've told us.