Do not feel crazy.
Do not allow other people, no matter how good their intentions, sway you from your decision once you make it. Whether that is now, a few months from now, or a year or more from now depending on how your experiments with various things go, the peace of mind you will gain will more than make up for any doubts that those people put in your head.
FWIW, the uni vets (or at least their spokesvet in the conference room after diagnosis) was one that said, “Oh, maybe give him a nice spring and summer …” but my own vet who knew me and him and our boarding situation was immediately on board with my decision once he saw the results from our trip for diagnostics. I guess what I’m saying is, trust your gut no matter what.