I'm sorry Lewes is not feeling like himself. From your description, it's possible that Lewes never got rid of that rubber band and it may be stuck in his intestinal system, causing a blockage. He could look bloated because he hasn't been defecating.
Another possibility is that he has a urinary blockage, which is a medical emergency in male cats. If he can't urinate, the toxins in his body are backing up and causing him to be ill.
He also could have ingested something he shouldn't have, like a toxic substance or another non-food item.
At this point, it would be best to bring Lewes to the closest ER vet to be evaluated and treated.
I hope all will be well with your furry boy!
Please be so kind as to rate my answer positively, from the ratings box at the top of your page; that is the only way I will receive recognition from the website for my effort and assistance. There is no additional cost to rate. Thank you very much!
Providing a positive rating will not end our conversation. Should you need me for any follow-up, clarification or additional information, simply click 'Reply to Expert' at no additional charge.
Please don't hesitate to request me by name, for any future questions; just type: "For Cher Only" to begin your post. Thank you!