Anyone know what happened?

So this morning I woke up perfectly fine. I peed and wiped and saw my period. No big deal. (Second cycle since miscarriage) So around 9 am, I’m at work and my cramps are unbearable. I started feeling dizzy and disoriented. Tylenol, Ibuprofen, nothing helps. I went and sat on the toilet. Then sweating, nausea, chills, burry vision, and I passed out cold. I woke up very soon (I assume?) after and cramps are still horrid. I’m starting to come to and not feel so weird now and I wanna know if this has happened to anyone? Was it from pain? Is the pain from the miscarriage? Just wanna hear some opinions!