Tampon fear. Need advice please !!

So I heard that woman have ended up in the hospital because of tampons and I read that the women mistaken the dangerous pains as period cramps. I started my period the day before yesterday and I use the knock off brand tampons because who wants to spend a fortune on name brand. Well, I use the super because of my period being heavy. I’ve NEVER had bad cramps but this month, the month I started using the knock off brand, I’ve had pains in my lower stomach, constant dizziness (almost fell in the bathtub and even had to sit down in the floor), the pains only happen when I move a certain way, heating pads don’t help and neither do ice packs, midol, ibuprofen, or Tylenol. If I cough it hurts so bad it knocks the breath out of me.

I just really need advice on if you guys think it’s period cramps or if it could be something to do with the tampons or maybe cysts? I’ve never hurt this bad. 😭😭