Help! I'm going mad

my period is late and I have counted every hour the last 2 days wondering if my period would start. I've been incredibly emotional and unreasonably teary. sadly I haven't had much support around me as no one seems to understand. in theory there is nothing wrong, no one has hurt me but everything is hurting me! so I know it's my hormones but I never pms like this- I know im due usually when I feel faint and weak but I do not cry non stop like this. so here i am with a missed period... starting to feel excited, maybe I'm pregnant??? I so want to be a mum and at nearly 38 I don't have much time. Or it might just be late. Or I might miss another cycle like I did 2 months ago... then I keep thinking about misscarrying.... again. Overall my brains working overtime and though I know I should relax and stay busy watch comedies and chill out... I can't. Does anyone know what I'm going through?  I can't take this anymore, my brain feels like a pressure cooker