Is PMS ruling me?

I've always had a pretty normal period , but since the birth of my last child 4 years ago, and a tubal ligation, my PMS is ruining my life. Or so I feel whenever I'm in PMS mode.

2 full weeks before my period starts. I notice I am less tolerable of situations, sometimes I get severe exhaustion, and alot of depression and crying or severe anger and dislike of people. I even went to see a therapist thinking I was going through something more but like I told him- I only feel this way when I'm about to get my period.

My fiance has learned to keep away from me when I am feeling like this , and I have alot of anger and extreme tension in my shoulders and the back of my neck. Mood swings like crazy, to the point where I can't stand myself, but once Aunt Flo begins, I am a totally different person and back to my normal self. I go back to my normal self once again, but it's gotten to the point that my period has really really affected my life from crying stages, to anger, to sarcastic, to uninterested and annoyed, all in a matter of days.

I hate feeling like this. it's terrible.
I take hot showers, directly on my back, i lay down because it's almost as if i cannot function at all , and then sometimes a lil bit of acne (yes acne) and nothing more. Not every month is the same but some months are pretty severe in mood changes. I don't want to lose my relationship over something I cannot control and believe me I try to control it. But he is definetely understanding,even offering me massages to try and calm down my severe tension.