Has anyone got any good tips on ways to increase self confidence/self worth, and deal with rejection/possible rejection better?

I have various issues in my life - a PhD I had to give up, health issues which are really bad at the moment which mean that I've spent a large portion of this week in bed, and now the possibility of a couple that I've kind of started seeing, maybe ending things or at least going pretty quiet on me, leaving me very unsure and generally feeling pretty crappy.

Because of my every day situation, I have alot of thinking time and few distractions, and not alot of energy or get-go to change that. I'm in a total rut to be honest, probably the toughest time of my life.

And now with what's going on with this couple, I feel I need to up my confidence and feeling of self worth. I think there are definitely voices in my head telling me I'm not good enough for them. They're super busy, social people with very intelligent jobs, and honestly I'm a bit embarrassed of myself and the issues that I currently have. And so I think that's part of the reason I'm struggling so much with what I see as possible rejection, but may genuinely be them being very busy and trying to keep it all casual, and maybe sensing that I was having trouble keeping it casual and trying to step back a bit.

Can anyone help with practical ways to feel better about myself?! Or just some kind words lol