PERIOD HELP!

Today is the second day of my period. My periods are always super regular and normal, not too heavy and lasting usually 4-5 day. This period is literally. Hell. I haven't worn tampons in like 4-5 months because randomly they started causing a lot of pain and intense cramping so I went back to pads. Unfortunately yesterday and today I forgot my pads and had to use tampons and I've already bled through THREE pairs of underwear while wearing a tampon..... This is extremely weird for me. Before I stopped wearing tampons I had been using them for roughly 10 years and I've never experienced this. I put a tampon in this morning at 10:00. It's only 11:30 and my tampon was almost falling out, soaked, my underwear was bled through, and as soon as I pulled down my pants blood was dripping everywhere. It looked like a bloody murder scene.... Same thing happened yesterday but after about 3 hours of wearing it. Today it's only been 1 and a half....