I definitely know what you mean. My anxiety always shoots when I'm PMSing. Usually I have a pretty good handle on it now, but that ToTM comes and it all seems to unravel.

The best thing I can suggest is to take it slow. Remind yourself that it will pass again and get easier - it is just hormones. It doesn't always work but can sometimes snap me out of the anxiety spiral by reminding myself that those feelings aren't actually because of a stressful event or something I need to worry about, just my body playing tricks on me.

Also, if you can try to focus on one thing at a time, one day at a time. Focus on what you need to do today. The other stuff can wait