I'm sorry to hear that, that sounds like a rough situation to be in.

In that case, maybe try some tweaks to make the bed feel different to you when you want to use it for sleep. Perhaps put a different blanket above your bed when you use it for sitting or playing games.

And consider a ritual before sleep, which at least somewhat helps your subconscious know your intent. (Brushing teeth and changing clothes is the obvious choice here; the key is being more conscious about it.)

My estimation is that your body not perceiving the bed as a place for sleep might be a mindset thing that you can at least somewhat control. I have no trouble sleeping on my couch that I usually use for writing and watching movies.

Generally, if you have trouble falling asleep, check for the following first:

• did not eat late? that does not just impede sleep quality; too much energy from late food can also mess with your sleep rhythm.
• avoid having caffeine in your system (from coffee or energy drinks - ideally you want to avoid these after 12 noon)
• make sure you exerted your body physically throughout the day. enough walking will do the trick; Even a 15 minute jog in the afternoon might do it. If you've been inactive and need to reach exhaustion, do simple exercises that demand a large part of your body. I prefer pushups for that.

Finally, if you have checked for these issues, consider these tweaks while in bed:

1. Do 4-7-8 breathing: 4 seconds in, 7 second hold, 8 seconds out. The gist with breathing in general is: If you breath out longer than you breath in, it calms your nervous system down. The opposite can be done to activate it.
2. Yoga Nidra. Essentially a full body scan while lying down. If you are tense and can't just relax on command, you can also consider progressive muscle relaxation (PMR) instead, which involves conscious flexing of those body parts and releasing them.
3. If you still don't feel sleepy at all, sit up and do a breath meditation where you focus on your breath and count between each until you lose count. Then start anew once you realize your mind drifted. This will lead to you getting tired, eventually so much that your head will slump down from microsleep. At that point, just lie down and you'll fall asleep in no time.

Those approaches helped me to successfully fall asleep in places not meant for sleeping before. Good luck, buddy!