Sudden love for hot/spicy food?!?

I have never liked hot food.. i couldn't stand it but recently after being sick i have been craving it. I can hardly eat anything now without hot sauce. Is this an indicator that something is wrong with me? My tastes have changes so dramatically that i used to drink coke every day and now it's almost unpleasant. Also coffee which was part of my every day makes me feel sick just thinking of it. Another strange change is that i love salad with lemon.. i can now eat a whole lemon straight and enjoy it.. without cringing at its sourness. Is my body trying to tell me something? or is it normal as i mature? i am 21 atm. Any advice would be great