I know how it feels mate. I used to have sessions like that every weekend. I would deposit £20 on PP and say that was all I would spend.
£15 in and £5 on the balance I would still be thinking about leaving it and using my last £1 on a silly 16 fold Acca. Then it would go and I would deposit again. Before I knew it, I would be balls deep on deposits, then stop in the bookies do some footy bets, play on the fobt’s and anything else I could do.
When I stood back and looked at it, I realised at the start I was £30 in with a £60 balance. So I was up at one point. When I started to realise this, I made a promise to myself. Any time I play and I’m in profit, I will cashout and if I lose a whole deposit on one game, I change games and stop chasing. Its helped, I seem to lose interest after 1/2 games. Usual sessions went from £300/£400 to £40/50.
Won’t work for everyone, but its worth a shot.
Worth remembering, money that you cashout, gives you something to look forward to. No matter how little.