Fluoride is a waste product. When I moved from the country to the city to go to college, I developed brown spots on my teeth called fluorosis, which is just one minor complication. (Oddly, one dental hygienist tries every time I see her to convince me it was b/c I *didn't* have fluoride growing up on well water. Every time she sees the spots and muses on that, I tell her they appeared only *after* I moved away from home.) Try the Fluoride Action Network and a story of how it affected some horses. Then hit fluoridealert.com and get the ADA's side of the story.
IF fluoride protects from cavities, it is only topically. Ingesting it is nonsense. Countless municipalities have begun to de-fluoridate their water supply. I buy two gallons of quality water each week for my family (we're far less thirsty now that we don't consume sugar and tons of grains, so it's enough even for the 7 of us) and use the fridge filtered water for the balance, although that filters only chlorine, not fluoride. It tastes so much better, anyway. It's certainly *more* expensive than tap water, but hardly a truly high expense. About $5/week.
That said, stress is worse for you than fluoride. If it's really stressful to research these things, take a break from it, do what you know, be at peace, and maybe revisit it later.