It does sound like you've over-extended your palate, although it's very odd that it lasts several days. You might try adding a palate cleansing routine to your smoking - when I am sampling a blend for review, I keep the following on hand to refresh both olfactory and tastebuds, utilizing them with each relight. One can get by with simply the third step (oddly, Mr. Neil Archer Roan's blog this week speaks on just this topic); however with the bolder flavours of aromatics and heavy English/Balkans the first two steps really will help.
1) Cup of Orange Pekot tea, steeped 10 minutes (Tetley brand, neat). This will not only cleanse your palate, but the steam will help to clear your sinuses. Unfortunately, it has a rather strong flavour itself, so I follow a sip of this with...
2) A slice of cucumber (long-English). With an almost neutral flavour, this will help to cleanse the tea from your mouth. Also helps to get any latent flavours and aromas out of the back of the mouth.
3) Finally, I follow this with a sip - and then a sniff - of distilled water. With a truely neutral flavour, this will "reset" your palate, and you should be good to go, tasting nuances and smelling fleeting aromas. Don't skip the sniff though; remember that half of flavour is aroma, and dulled olfactory senses mean dulled flavours!