What Causes Breast Tenderness 2 Weeks Prior To My Periods?

I'm a thirty six y/o female (two children 15 & 5). I've been having extreme breast tenderness about 2-3 weeks prior to my period which has been increasingly coming later and later (from the 1st to 5th to 11th to 18th). Last few cycles, my abdomen gets distended and feels sloshy, I have abdominal aching for two or more weeks before and really sharp cramping in my lower pelvis and upper thighs when my period starts, it's quite heavy for the first two days. Sometimes it's extremely painful to go to the bathroom. I leak clear, odorless fluid on regularly the 2nd and/or 3rd day of my period, sometimes this may come in a gush which is highly embarrassing. Occasionally I have a mild fever, swollen glands, feel dehydrated and am extremely tired. Even my husband has notice this all coincides with my cycle which I hadn't really thought about. My last ob/gyn visit a few months back and trans vaginal ultrasound was normal, at the time I mentioned I had a lot of abdominal aching in the lower left side but not anything else.