This is the most depressing thing to do, you'll be surprised at the amount, I did this 4 years ago on offline number betting and Lottery I kept all the tickets I sometimes win 3rd and 4th prizes but every time I won consolation I increase my tickets I consider this a sign that I will hit the jackpot soon but unfortunately it never happens.
When I count all my losses on numbers and the lottery it's enough to buy a small parcel of a lot and build a bungalow type and we're just renting a room back then.
Again I did it 3 years ago when I become active in online casinos and the amount is also depressing I could have bought a tricycle that I can use for a living.
So I stopped counting my losses and just minimize my betting I just tried to be happy on the thought that I have good times betting and I enjoy the thrill.
You have said it yourself that it is the most depressing thing to do and I agree to that 100%.
You should never consider counting losses "in gambling" because you will end up getting depressed.
We all know that most of our bets are losses and even if we win, we gamble again and eventually lose it all.
So when we already know that the number will be huge then to waste our time counting the losses when we know it will be depressing.
Besides that, gambling is for fun and why to calculate losses when it was fun to gamble that money.