It’s time to start putting the focus back on your emotional wellbeing. On doing things that make you happy, making time every day to do something (no matter how small) that makes you smile.
I wanted to offer some advice on coping through the extra waiting, the uncertainty of when your treatment will actually start and getting yourself ready (emotionally) for starting treatment.
It is really important to acknowledge the grief, to realise that it's ok to feel that way, and completely normal.