that does sound alot like swim bladder you should lower the water level so it isnt such a struggle to get air. How long has it been going on for? it could just be he is still healing from the fungal infection but bettas are more prone to more diseases after the first disease.
Hope it is...
Little kids are so funny with there words when i go to collect my son (5 years old) i hear lots of other kids on field shouting "watch out *****" but what there trying to say is "watch out ditch" most are the same age as my son. it cracks me up.
He is a stunner lovely colouring! i have 4 males and 2 females but soon to get another 3 males so im kinda a betta addict. you should call your betta pink panther.