Is it normal to get bad anxiety when thinking of telling my crush i have ......

Feelings for them! Every time I think about telling this particular person I have had strong feelings for them I get anxious. At the moment, I have had really bad tight/rock feeling in my gut when thinking of telling my crush my feelings. We are meant to meet up less than 2 weeks away but i think I've gone crazy because I'm in so much body pain its not funny! The anxiety is killing me and I'm worried about my well being! I've had anxiety in the past , couple years back and it was so bad i didn't think I was going to survive much longer. Will this anxiety go away after I've confronted my fears or will I be left with this !?? I can't push it off my mind either and every day is killing me!