With all those Antibiotics it would be wise to load up on PRObiotics to replace all the beneficial bacteria that the Antibiotics have killed [they kill em all, bad AND good] in the gut. Probiotics are just smart all the time to get the levels of good bacteria to an optimum level and keep them there.
Good job on doing what you're 'gut' tells you to do instead of what the docs tell you to do. Yeah, tea tree oil is too strong straight up. Hydrogen peroxide is something I use in ears a lot, esp. at the first sign of colds/flu, etc. No burning.