Hi there. I know how you feel.
Just before Christmas about five years ago, I noticed a very dark brown/black raised spot between one of my toes that definitely had not been there before. I plucked up the courage to go to the GP. Unlike many people with health anxiety, I will avoid the doctors until I'm utterly convinced I'll die if I don't, because I'm terrified that I'll get bad news and if I don't go, I can't get it and it won't be happening. It's most irritating! Anyway. The GP looked at it and said "oh dear, that does look concerning. I can see red in it too. Not good at all. I suspect that's something very nasty." They referred me to dermatology and said there would normally be a 2 week wait at most but as it was Christmas time it could be 4.
I spent all of Christmas and new year crying in the bath or shower, begging to all the gods I don't believe in not to take my children's mummy away from them, googling like mad and obsessively staring at my foot, mentally planning my funeral. I had palpitations, nausea, insomnia. I could barely eat, I was in a 24/7 panic, replaying "I suspect that's something very nasty" over and over.
It actually turned out to be a blood blister and the dermatologist was most annoyed with the GP, but I wanted to show I do understand what you're going through right now. And I know that the other posters telling you about BCC will only have you thinking about the what if's of that situation, no matter how extremely unlikely those are. But you should listen to them, because if that's what that is (probable that it's just a normal mole really though) they're here posting about it to you. Not dead and buried from a bunch of abnormal cells that do nothing but sit there in 99.999% of cases. They're reassuring you from experience and almost every single person who got diagnosed with BCC today will be absolutely fine and have no consequences at all. The whole world over. And the majority of people who ended up at dermatology to query BCC or SCC were told they had normal moles.