Hey Adam, thanks for sharing and welcome to the forum. I was never able to hold onto the money I had available neither. I could never leave a loser. I would either be up for the session and quit or gamble, stepping up if necessary, to the bitter end.
I was well aware of this and I made a good portion of my money unavailable / not easily accessible to me. It was in an account in a different country where it would take 2 or 3 days for it to clear into my current account and only then I could use it for gambling. In addition to that the amount I was able to transfer on any single day was limited.
So whenever I was steaming out of my ears (which was often) I could only lose the money I had available and never the money that was put aside. By the time I transferred the money back to my current account and it cleared I wouldn’t be steaming so badly. Also, whenever I won anything meaningful I would wire it to the account I didn’t have an easy access to.
Anyway that money you had is gone and you can’t have it back. It is no longer yours. What you can do is make sure you don’t lose more. Actually you can make sure you never lose another penny. Easier said than done, I know. I’ve been fighting my demons for decades and I gambled as recently as yesterday. Go figure.
I would recommend that you read “the easy way to stop gambling” by allen carr. It is quite a good book.
Out of curiosity, you mentioned in your post that you’re waiting for a bonus / cashback money from BetFred and if you got it you weren’t sure whether you would gamble with it or cash it out. Were you serious? Did you honestly think there was a slightest chance you would not gamble with it? I’m not trying to rub it in or anything, I just think it’s highly unlikely you honestly thought you would not gamble the money readily available in your betting account. Not to mention the fact that you probably can’t cash out bonus money till you meet their betting requirements (i. e. betting 8x the bonus amount).
Good luck. And make sure you come here often and post often. you will find it helpfull I’m sure.