Have you ever felt so unworthy of love it made you feel physical pain?

I’m not talking about the feeling of – “Am I worthy of love, will I ever find it?” I mean, when someone is actively showing you love and trying to give you love, and it makes you feel almost ill, like they have the wrong person, that there must be some mistake, and that much sooner than later they will realize this and somehow reprimand you for accepting it? Like it’s something that’s been stolen?

How can I get over this and not let it ruin a relationship with a beautiful person? Have you ever felt this way?

P.S. I am recovering from BPD and recently experienced a couple tough social losses including a romantic breakup. I just want to relate to people feeling this sickening feeling of being unable to feel worthy of being loved, couldn’t find much relevant by googling.