You don't need to hide the fact that you're in recovery, but you don't have to share your history of addiction with acquaintances at work, either.

Arm yourself with as many options as possible before making your next move.

Bad dental hygiene can lead to respiratory infections and an increased risk for heart disease and strokes.

If this is something you'd truly like to work on, not out of a sense of guilt but because you would enjoy occasionally reciprocating, there are a wealth of resources out there for the enthusiastic amateur (you are far from the only would-be blow-jobber whose spirit is willing but gag reflex is weak). You have more options than "no blow jobs, ever" and "regular whole-hog sessions to completion that result in vomiting."

You, too, will someday die, perhaps under inconvenient circumstances, at a time when you do not particularly wish to, and for causes that you cannot yet predict.

I'm of the belief that dating "potential" is almost always an exercise in frustration.

I don't think unfriending your old crush on Facebook will do much other than remove him from your Facebook feed. Don't beat yourself up over what you dream about; there are a lot worse things that could slip across the transom of your unconscious mind than an old high school crush who was always nice to you.