PMS anxiety and suspicions...

About a week before my period I get really anxious and suspicious of my boyfriend. I have absolutely no indication that anything is amiss (I always have access to his phone and he asks me to check his text messages when his phone goes off without knowing who it could be). As soon as I start, the feelings go away and I feel secure in myself and our relationship again. Does anyone else have this issue? What do you do to make it better???