Well that's great news and so lucky about the charge!
Please bear in mind as mentioned above hay is 80% of what they eat so if he loses weight it's likely from not being able to eat his hay properly. Offer him fresh little handfuls during the day and check he's going at it. If you see him sniffing and pawing it but not eating it properly that should ring an alarm bell. The weight can go down and up, sure, but the hay is also needed to keep those ever-growing teeth in check so a couple of weeks not eating hay properly can start to affect the teeth. If you have any fresh grass where you are that hasn't been peed on by animals (sorry if it's winter in your country!) that might tempt him too... but just a little at first if he's not used to it. If he starts losing weight day after day after day come back to this thread rather than starting a new one so folks can see his history - but here's hoping he's OK from now on!
This putting piggies on beds seems to be 'a thing' at the mo... there's even an advert on tv here where someone is getting banking advice from her piggy as they both sit on the bed. Maybe it's been a tiktok trend or something that I've just missed. I sit on the floor with mine - they can't judge heights at all so they
will just blindly jump. Today George was having a few ml of syringe food to top him up and after every ml he got a tiny square of lettuce as a reward (he knows the routine now!) when I suddenly felt something and turned to see Flora licking my knee! "Can I have some treat please?" Of course! Lettuce bits all round