I was like that when I play at first. I played a lot of consecutive hours, like 5-6 hours. It damaged my health, I think, especially my internal biological clock for sleeping.
The best is to stop after an hour. Get 15-20 minutes of rest. Then start again. Shorter stints but with an obligatory stop.
I have a friend who only play the first two Lara Croft games. I don't understand it, but he is kind of the expert on those games. I wonder sometimes if he isn't stuck in a very narrow world vision. And part of his behaviour and opinions, kind of say that too.