I have major issues when things are going well.... It's like I cannot accept it.... I do this with most things/people. It seems I am most comfortable when there is drama going on that shows my negative side to others.
I think its part of being a borderline... can't trust the good. can't believe there's anything good about you. waiting for the other shoe to drop.. for the fallout to come.
I hope that you can find a way to be pleased with yourself for the promotion. Try to focus on you.. never mind what other people are saying/doing..
One thing that I find is to try to brush it off... and I mean literally, put one of your arms out and sweep the opposite hand from shoulder to fingers and away, repeat on the other side ... until you feel some relief.. breathing exercises, such as counting your breath "In 1, Out 1, In 2, out 2..." do till 10, and then go backwards... this might help with the knot in your tummy