Homecoming

so I started my period a week early and my homecoming is in two days. A tampon has always freaked me out and I’ve worn them before but they hurt so bad that I try and not use them as much as I can. It’s not that they’re too big or I’m not getting enough flow, I actually have very heavy periods and it hurts to insert so I use small tampons. The day of homecoming is my third day, which is typically one of the worst days, but with my dress I HAVE to wear a thong, which means no pad for me. What should I do????