It is possible if he just accumulated it over time; he didn't say how long, but if he said that it was just for a day or even a week, then that is not possible unless you are a heavy sports bettor and any kind of game you are betting on is all in. For sure, the OP learned a lesson from losing all of his profit or winnings, but the problem is that if he continues to bet big, he will commit the same mistake again. It is really greediness that even though you won big, you still want more. It is like you want to make the casino bankrupt, which is very impossible as for sure you'll lose all your money doing it.
Yes the main reason he feel that way because of his greediness which makes him lose everything. Greediness and addiction are link to each other and can affect our lives. Mostly the reason why someone cannot get over with his loses it is because he want to get back all of it or simply we can say it is because of his greediness , all people has a greed inside but we need to control it.