Hi Sam, I'm glad you posted. First of all, never give up and always have faith you can do this.
I suggest that you post and read here at SR every day. Make it a routine. And, I suggest that you join the December group. These are other people who have stopped drinking this month and I think you'd find extra support there. Here is the link:
https://www.soberrecovery.com/forums...-part-one.html (Class Of December 2022 Part One)
Can you call and speak to the people who offered you the NHS health coach job. Perhaps talking over the issue and explaining that it was 4 years ago and that you hadn't been trouble before that or since then.
If you want to keep the new girlfriend you have, the best thing you can do is to stop drinking. Be present and be the best boyfriend you can. If you continue drinking, it's unlikely the relationship will survive in the long term.
I think it's great that you're planning to see a psychiatrist this week. Hopefully it will be helpful for you.
Never give up, Sam.