I think the important thing for you to keep in mind is not the particular disease or problem you think you have, but remembering, that in the context of anxiety, certain behaviors are going to lead to certain outcomes.
For instance—Googling. You know it's ill-advised, you say so yourself that you, "know better." And that's true—we all know better, but we do it anyway. However, as long as we CHOOSE to engage in that bad habit, we MUST be willing to accept the natural (and near scientifically proven) outcome of Googling, which is an increase in anxiety. We CANNOT escape that trap. CANNOT. It doesn't work, not even a little.
So if you want to gradually lessen your anxiety, you're going to have to choose to engage in less anxiety-provoking behaviors—which is much easier said than done. To that end, are you currently pursuing any kind of anxiety treatment?
In the meantime, take your antibiotics. As long as you're not taking them all the time for things that they're not necessary for, there's no harm in them. What are you taking them for?