Are you taking in too much pepper? Warning - those pepper capsules can cause some serious bum burn when you eliminate tomorrow. Have cool wipes handy!
I experienced something similar last time - burning throat and tongue. It was the pepper - I was taking too much. I made a mistake (for me) by taking the capsules -- and was literally burping pepper - it was just too much. I also burned my throat by adding too much pepper to my drink once.
This time around I'm very dainty with the pepper. A smidge on the tongue and a quick swig. I don't put it in my drink (as it gets hotter the longer it sits) or take the capsules. My throat and rear are thanking me!
And a full capsule of pepper is more than a day's worth (IMO) so you may want to go light on the pepper tomorrow and see how you feel.