I have done this in regards to myself. And now, I have officially done this in regards to my fish as well.

I thought I saw a small white patch on my betta but only when looking from a certain angle. His fins are also ripped. He must have columnaris.

Isn't it unfortunate how we can get ourselves worked up because symptoms of serious diseases can also be symptoms of passing ailments? With people as well as with fish. When I was younger I used to google my symptoms and at one point I actually DID think I had brain cancer!