My first wife was a TV and film make-up artist, and they always used bananas when they wanted to simulate hurling. I hadn't heard that expression before, by the way - it's a cracker!
Try remembering something humorous or revolting, to bring the nerves back down to earth. In the 1980s, my former wife was involved in a TV programme about the poet, Keats, who had been a student surgeon as a young man. The BBC wanted to show an eighteenth-century leg amputation, so she bought a big leg of lamb, and they put the actor on a table, with one leg through a hole that had been cut out. Then they placed the leg of lamb next to his knee, and covered over the cracks with special effects plastic and rubber, and they inserted a number of tubes from underneath, with stage blood and hand pumps at the other end.
When the actor who was playing the surgeon got out his saw, he hacked through the leg of lamb, flesh, gristle and bone, which sounded very realistic (so I was told), the amputee screamed like there was no tomorrow, and the make-up ladies pumped blood which spurted out all over the place. Lost your nerves yet?
They never transmitted the scene, presumably because the director decided it was just too gruesome. I get nerves as much as anyone, but private thoughts like this can be a help. It is only a concert, after all; you are not having your leg amputated. I also talk to audiences, which they really like, and it makes the occasion feel more sociable and less threatening.