I can totally understand not wanting to jump the gun and bringing him to the vet when you can possibly treat him on your own. There's a lot of very knowledgeable people here on BYC that may be able to offer you advice! I hope that your rooster gets better soon!
Haha, yes! The chickens...
If you're worried about him, you should definitely take him to the vet. I see you're from Hawaii as well. Do you have a vet that you visit normally? If not, try and find one that treats chickens, because not all vets do.
I hope that he gets better soon!