HELP! SICK BETTA!!!

HELP! He's still struggling! HELP!!!
 
He's got a distended belly and he seems to have an appatite, but I haven't tried feeding him anything except peas, which he hasn't eaten.
 
How long since you fed him? I would give him till the morning and them feed him a tiny bit, ie one flake. It could be a parasite, a blockage, or a dozen diseases we know nothing about. Epsom salts can help with swelling.
 
He had one small pellet (not a betta pellet, but a regular fish food pellet) last night and before that he had his regular "meals" on Friday. He ate just fine then.

Also, I don't want to move him from the 10 gallon to the one gallon because I'm affraid it would stress him out too much. If I did an epsom salt bath in the tank he's in now, would it be safe for him to be in there after about 10 or 15 minutes if I did a partial water change?
 
I hope Magellan will be ok. I wish I could help.
 
Add the salt to the tank? Should I do a PWC afterward?

And thanks for the well-wishes! He's fighting but he's still not looking very good.
 
Just an update. After a long fight and trying hard to make it, Magellan passed away early this morning. He will be greatly missed and was a wonderful fish. I'm just glad he won't be suffering anymore.

Thank you all for all of your help and suggestions and well wishes. I appreciate everything everyone did to help us!
 
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