i've had this happen before... finally i found out what it was. when mine came out i wasn't on any sort of cleanse - in fact it was before i got into all of this stuff. maybe the extra toxins from the cleanse caused an excess of bacteria. (i'm assuming you still have your tonsils).
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Tonsil stone: A tiny stone (calculus) in the tonsils.
These stones, called tonsilloliths, are found within little pockets (crypts) in the tonsils that typically form in chronic recurrent tonsillitis and harbor bacteria.
The stones are foul-smelling. They tend to contain high quantities of sulfa. When crushed, they give off the characteristic rotten egg smell which is well known to cause bad breath.
Tonsilloliths may also give the sense of something being caught in the back of the throat.