Sorry OP but your posts aren’t really clear and you’re letting emotion cloud your judgement.
I agree with this. Sorry, cannot really make sense of what you are saying and the options and difficulties and how many old or new jobs there are. I read all your posts. Expressing yourself clearly is quite important for senior leadership roles.
If you say you are very senior in your job (top 1% at the company), I would put you at C-Suite or higher. There isn't much room for lack of self-belief at these levels as you are firm leadership, required to set the strategy and implement it.
Sure, people first promoted into these positions need to grow into it, but it is usually a lack of a certain skill set rather than a breakdown of confidence. Hopefully the only thing you have presented to your boss is flakiness and you did not let on about the panic attacks.
It is fine to be flakey in more junior positions and resign/anti-resign, but not so much in senior positions. In senior positions, you need to play the game and have a 'game face'. Nothing Machievallian, just outward leadership and authority. The buck stops with you.
It depends on the reason you gave to your boss about why you did not take the promotion and for the verbal resignation. If indecision or flakiness is the worst you presented, then I think you can come back from that if you present to him on Monday a firm plan and the reason why you are now committed to take the challenge at this firm and not at the higher paying offer company (I hope I got that right).
You can get over this and convince your current job and boss to have confidence in you again. I agree with the other poster who changes jobs a lot. It takes me at least a year to not have buyer's remorse at changing jobs. Stick it out and it gets much much better after that. Be kind to yourself. We all make mistakes especially when new. You did not try to cover it up. You owned it. So you will improve and get better. That your boss knows that. If your boss sees commitment on your part, they will want to support that. But it has to come from within you, so demonstrate that, using your game face, if necessary. 