Developing paranoia and anxiety while pregnant, advice?

I feel like the more pregnant I get the more paranoid and anxious I get. It will be so bad that I will have thoughts like, "If I dont drink all of my water but the last sip something bad will happen to the baby" Or Im really cautious with my food, even at my own house like someone messed with it, when I really know its fine but still wont eat it or whatever if I even get a small feeling of doubt. Im always worried something bad is going to happen. I have these very ritual like habbits that in my strange mind I think are going to keep the baby safe, like doing folding the towels one way as opposed to another way...really silly stuff. Did anyone else have this and how to you cope with it? My boyfriend and friends dont understand. And I dont like living like this either, it runs my life! I am 27 weeks pregnant.