How to deal with the Anxiety?

I already have a child (he's 17 months old) but he had issues during my pregnancy, which made scans pretty traumatic for me. I would be violently sick before every scan (they were monthly at one hospital from 13 weeks, and I had 3 at another hospital between 12 and 24 weeks). With my second pregnancy I felt much better because I believed it couldn't be worse. At what should have been 8 weeks I had a scan and measured at 5.5 weeks, another scan 2 weeks later confirmed beyond doubt that I had suffered a missed miscarriage. My anxiety surrounding scans was bad enough but now I'm honestly terrified of them. I'm 5 weeks pregnant today and I want an early scan in an attempt to lessen the anxiety I have. I've been having chest pains and uneven breathing since I found out I was pregnant again.

How do I cope with the anxiety? Will anything make it better or will I be like this throughout this pregnancy (and any I have after this)?

I'm really struggling to be hopeful with this pregnancy, I'm not at all attached because I'm completely convinced I'll just get bad news again and I don't want to feel like that.