YE, you got a mouthful of the good ol' rust my friend. Used to happen to an old MYA hose I had... A buddy of mine used it all the time and he washed the non-washable hose after each use. Pretty soon I started getting pieces of gunk in my mouth while smoking. After a few weeks at this I REALLY started tasting a metal taste and more gunk, I finally saw him wash out the hose that day and figured out the problem.
I'm sure you would definitely notice the REALLY bad taste and more than likely have breathing problems for the next couple weeks, or even the rest of your life, if it's black mold!
Seriously though, that sucks really hardcore, sorry to hear about this.