Hello... I don't really have much to add with this except I have a beta that i rescued from the pet store for roughly a year now. He wasn't in the best condition when I got him so i tried to give him the best life I could. I kept him in a 3.5 gallon heated tank with a filter. Anyways, 3 days ago he was not moving and the pet store told me to just let him go since he might have been adjusted to a water change. Well, I did just that and he stopped coming up for food so i used tweezers to feed him.. But he stopped eating then as well. After a day or two he seemed dead. He was not breathing through his gills and he would just lay at the bottom on his side. In fact, I thought he was dead and was going to dispose of him until he squirmed.. So i just let him for another day. Today I gently applied a bit of pressure to him because i thought he had finally passed away and he was in fact not.. But his body looked like it was completely disintegrating. After applying pressure I also saw his gills breathing which i had not seen in the past. After realizing he had been suffering.. I quickly took to google to figure out a remedy to relieve him of his pain as a store is not open for me to get clove oil. So, I used baking soda.. It's been a half hour and hes still alive.. barely ... but I feel absolutely terrible that I put him through this and don't know what to do. I also stopped his heat and filter so I don't know how to end his pain. I saw him flipping around and it makes me sick to my stomach. Thanks for any help.