Coping with anxiety?

I've always been an anxious person - an over thinker, a worry wart. 
How do you ladies deal with added pregnancy anxieties? I've began the discussion of postpartum care in case it spirals into depression etc with my midwives, but I'm wondering if there's something I need to do now to get my mind in check.
I find myself laying in bed, not sleeping, my mind goes something like this: "What about  whooping cough, talking to relatives about getting their vacs, childbirth complications, what if I fail at breastfeeding? How do I tell my mum I don't want her at the birth? Will people respect my wishes and give me time after birth before bombarding me with visits? I've gained too much weight this pregnancy, I need to eat better.... what if what if what if...." and it goes on and on and on. I'm doing my head in. 
Help 😖