Hi Meggles,
I'm so sorry you are going through a tough time. I suffered from GAD for most of my life until years of treatment and medication got me in a better place a few years ago. With my first pregnancy the GAD came back and I felt a lot of the things you have described, which was really awful after feeling great before that. I felt like I was going mad. I ended up having a miscarriage at 10 weeks, the day after the D&C I woke up and felt normal again - no GAD at all. What this told me was that it was so much to do with my hormones & was temporary. The first trimester is the worst for that I think. It is great that you are reaching out to get help - keep talking to people about how you feel if you can. Have you tried to do some visualisations or calming exercises? Whatever helps you to get through - meds, therapy or joining a group. Maybe your hospital has a support group?
big hugs to you, I hope upping your meds kicks in and you start to feel better really soon. But you are doing so well by talking and reaching out. I think we all worry about the big picture (can I cope as a Mum? etc), but maybe it would be helpful to think just this minute for now. By looking after yourself you are being a great Mum already.
:hugs: