Romantic (emotional) interest making me feel sick

Does anyone else feel physically ill when having romantic interest in someone but then confessing said romantic interest? I just told someone I'm in love with them, I told them the truth. They haven't responded but I feel sick to my stomach. I know regardless me and them will still be friends, it's truly not that big of a deal, I know it isn't. When I talk to them typically I have butterflies, I'm blushing, etc. They're just dense and didn't realize that I liked them romantically. This isn't anxiety, I've had this same feeling even when they just call me and talk to me. I want to vomit!