Also I would let him sleep as much as he needs to
We had the sickness bug a few weeks ago and it was horrendous so I feel for you!! I kept offering meals just more plain ones, if he doesn't eat much don't worry just try and keep getting fluids down him. We had to play games with water to get him to drink. He spent a lot of time in the bath with me pouring water into his mouth from a play watering can 🙈😂
It's good that he's kept the biscuit down, my understanding is that you should stick to plain foods for 24h from the last sickness episode: banana, plain rice, etc Acidic foods etc could upset his already upset tummy and might end up throwing up again.
He’s been sipping water so I’m fairly happy with that I do just feel like he needs to sleep whatever this is off!