I took some tylenol (acetaminophen) sinus relief and now i can't smell anything and can barely taste anything?

Time to see the Dr.: Your sinus infection has worsened to the point where you now need to see the Dr. Good luck.

Sounds like you: are stuffed up. Most of our ability to "taste" is derived from our ability to smell, and the nerve(s) that permit that are way up in the top of your sinuses. Even if you can breathe better, you can still have secretions in the upper respiratory tract blocking your nerve that percieves odor. The tongue can only sense salt, sweet, sour and bitter, & umami, everything else you taste is in the scent.

Sounds like: your sinuses have become either completely congested or possibly infected. The loss of smell and taste has more to do with your nasal congestion than the Tylenol (acetaminophen) Sinus medicine, which should help not make matters worse. You may want to try an over the counter saline rinse for your nostrils, but if that doesn't help, see your Dr to rule out a sinus infection.