Well, good news, i cant see anymore red on his sore, its just a bit pink, still open though. I took out all the decorations except for the plants and gravel, kept up on the water changes and gravel vacuuming, salt, and melafix (just the residue from the teasppon after adding it to the 20 gallon for the goldfish' ulcers). Cant afford a tank heater now so im using a heating pad.
Well, time from some good news! The hole has completely healed over, now it just looks like a pink scar, no scales have started growing on it, but i dont think any new ones will, but hey, i could be wrong. So, some good news during a bad week.
If he's still not eating, try putting a small garlic clove in a little warm water, soak a few pellets in there for 5-10 mins. and then see if he eats that. I do this for all my bettas anyway bc i think i had one that died from swallowing a pellet dry and it got stuck in his throat :(