Feeling unworthy of happiness is definitely something I can relate to. As soon as life starts going well, I have to be hypervigilant of self-destructive, self-sabotaging behaviour. It's incredible the disastrous rampages I've been on when tmy life is close to being "in order". My happiness is always tinged with massive amounts of anxiety and guilt.

What helps for me; remind yourself, you deserve to be happy. Be gentle with yourself. Pay attention to your inner dialogue - you might find that it's very punitive.