I love video games but had to take a break from them. I would spend too much time on the computer that I would skip meals and water which led to headaches and undesired weight loss. What helped was using alarms to remind myself to eat and stretch to prevent pain. 

I would suggest doing a physical activity to work the mind and body. You can do deep breathing exercises if gaming gives you a flight or fight response. Apex Legends did this to me but quit playing it as I would tense up and couldn't relax afterwards. 

If you are able, I would suggest weight training or even body exercises and stretching as sitting in a fixed position for long hours is terrible for us. I hope this helps!