Is this normal?

For the last year or so my period has become pretty irregular. My cycle is anywhere from 18-36 days long and I start having period symptoms up to 10 days before I start. I start cramping, get very bloated, retain water and get very angry and that lasts a week-week and a half before I start and goes on until a few days after I start.

My period is very heavy and sometimes the cramping is just so bad. I get horrible headaches, too.

I’m 26, have 3 kids (youngest is 2) and have never had an abnormal Pap smear. Before my third child I was more regular 28-30 day cycle and didn’t have the horrendous cramping and my symptoms didn’t start until I was a few days away from starting.

Is this normal? Should I see my doctor?