Hey, there!
I don't know much about endo since my valve repair was because of severe regurgitation, but I can completely empathize with you. The thought of endocarditis scares me silly! For months I was completely freaked about getting it. Started when the cardio caring for me in the hospital post-op saw that my temperature had spiked slightly and mentioned something about a "valve infection." Thankfully, that didn't happen. When I needed a dental cleaning 4 months after my surgery, I was completely scared, even though I'd loaded up with Biaxin (antibiotic) before the procedure.
I still worry at times about crap affecting my valve, and not just bacteria and viruses. Stress, my own personal "high-strungness" (or what my cardio thinks is anxiety), and all that, I think, sometimes make me worry about what it's all doing to my heart.
Don't feel bad about being paranoid. You're not the only one, and interestingly enough, it comes with the territory of being a valver.
Funny thing is, I didn't worry much about my valve until I needed surgery, and now that I'm almost 2 1/2 years out, not a day goes by that I don't think about it.
Best,
Debi (debster913)