Don't give up yet
Something I read was to put him in a container that is closer to the surface so it's easier for him to breath, or just get him out and quarantine him in "fresh" dechlorinated water. Fish can survive up to 14 days without eating so there's a little bit of time there.
I'd suggest that you post on bettafish . com in their emergency forum, linked below. I'm a current member and I'm seeing that there are very experienced members registering on a daily basis. They've upgraded the website so it's easier to use than it was, and it's an allaround better experience than previously.
Betta Fish Diseases and Emergencies
The very first pinned item at the top of the page in this forum is a questionaire you'll want to fill out regarding water parameters et al, which helps the experts better determine what can be done to help.
Something I read was to put him in a container that is closer to the surface so it's easier for him to breath, or just get him out and quarantine him in "fresh" dechlorinated water. Fish can survive up to 14 days without eating so there's a little bit of time there.
I'd suggest that you post on bettafish . com in their emergency forum, linked below. I'm a current member and I'm seeing that there are very experienced members registering on a daily basis. They've upgraded the website so it's easier to use than it was, and it's an allaround better experience than previously.
Betta Fish Diseases and Emergencies
The very first pinned item at the top of the page in this forum is a questionaire you'll want to fill out regarding water parameters et al, which helps the experts better determine what can be done to help.