I've had my period for two days, light flow, then it stopped for about two days. Then, WHAM, it's back for four days, with heavy flow. After four days, it stopped, which was fine. BUT THEN (dum-dum-dum) it started again! Today is the second day since the "second restart" and it is bright red (brighter than normal) and heavy. Is that normal?

I am 29, have no kids, am not on any contraception at the moment. I am a bit stressed out at the moment, having a slight case of insomnia, but other than that, nothing that I can think of. 

Can someone please shed some light on this, as it is driving me nuts and worrying me at the same time. Thanks :)