If you work in a hospital, I think people should be more sympathetic to your situation! They see "sick" people all day long and I would assume they don't judge them and tell them they have to go!! Plus BB is not contagious!
In what do you consider yourself sick? Do you think there is more to our bad breath, like something that is actually threatening our health?
My last boyfriend had really bad breath and he was loved by everybody because he was confident and funny. Also the first thing he used to tell me was:
I am a bit embarrassed to talk to you so close because I have chronic bad breath.
He stepped back one or two steps (about 4 feet from me) and kept talking.
I had never heard someone talking about his bb so matter of factly and I felt totally comfortable with him. I kept my distance whenever he was talking, his breath was not too smelly when air was just been exhaled, it's talking that was the problem. He ended up having a tonsillectomy. He still had bad breath sometimes afterward but it was really tolerable.
I've had teacher that had really bad breath too and we had lots of respect for them because they did their job with focus and confidence, and they were funny. Humor really helps.
About Parsley I don't know. Try again if it seems to work for you. And about the fish smell thing, if there is no cure to it, I think it is easy to get a diagnosis though.