I would not continue to feed the wheat pellets without a soak. I'd be afraid of creating constipation issues. You can look for some New Life Spectrum Betta or Thera A 1mm (don't get the bigger ones they do have some large ones.. or you could crush up the big ones too into smaller bits I suppose) to try because they're loaded up on garlic and he will probably love them. Petco carries them both, or at least my local one does. The Thera A have some fruit and veggie extract and my fish tend to pass them too quickly imho so I only feed the thera A once or twice a week because they seem to be working like a laxative on mine but they sure do help with bloating if there is any other underlying issue here around constipation.
You can get kanaplex, furan 2 and vitachem all here: http://www.drsfostersmith.com
It also has Thera A
I can also ship kanaplex to you, possibly faster. I don't know about vitachem being in stock atm and Furan 2 I have to drive an hour for, but I have to ship out metro and focus to another forum member today anyway so I'm headed to the pet store w/ the kanaplex right now. If you want me to get you some pm me with an address I can use.