I need some advice. 

I recently started a new job on an intense nursing unit and there's a lot to learn and I started to feel anxious and overwhelmed. I am normally an anxious person but I feel that I manage it quite well. But with this change it like kicked up immensely strong feelings of anxiety and it came with a lot of insecurity and lack of confidence that I haven't felt in years. It reminded me of when I was in my clinicals and practicals in school. I started to fear that people would think I'm stupid, I started to doubt myself, and I became very withdrawn. Everyday I would come home and study what I've learned at work and make lists to try to better myself.... but this didn't help to calm my anxiety, I actually just felt worse because I felt like I knew nothing. 

For some reason I feel like I am never good enough. This anxiousness started to bleed into my marriage and other relationships. I started to feel like I couldn't manage my regular housework and I find that I'm nervous all the time about everything. I get extremely nervous before work and during work. I find that I can't socialize at work because I need to make sure everything is right. I ask a million questions to try to understand things better and then I worry if I'm being annoying. I feel like my mind is tormenting itself. I have to add that each day I do feel a sense of accomplishment when I'm done. However, my mind sometimes trails off to "worst case scenarios" while I'm there and then I end up mentally spiralling. 

I've only been at my new job for 1 month and everyone has said it takes time to adjust. I worked on another unit previously for a few years which was much slower. However, both units are in the same hospital and although most policies and procedures are all the same I find that I get SO anxious that I "forget" how to do stuff I've been doing for years. 

Has anyone else ever felt anxious over change or felt similar to what I'm feeling?