Yep, anxiety completely sucks.
I've been on top of it all day. Decided after breakfast to stay at work and ride it out and I'm glad I did because there was no more melt downs and I just got gradually stronger mentally throughout the day. Pretty much back to normal now although dreading the drive home and staying later than usual to avoid it! 
Had to laugh at lunch time. I was there pouring liberal amounts of olive oil over my salad leaves and chicken when a friendly neighborhood slimming world member appeared over my right shoulder to inform me that I could replace the oil with FF salad dressing and it's MUCH better for you! SHe commented on my weight loss earlier today (I'm wearing a top that makes it more obvious it seems!) so I politely replied that I'm actually on a high fat, low carb diet and I need the fat to stay satisfied.
Mind = Blown.
She could not fathom that I was eating fat at all. I chatted to her about my day to day eating and the types of things I can eat thinking I'd created a convert, when she suddenly said with total ernest: "So it's like slimming world, you can eat as many vegetables and potatoes and things as you like just as long as you don't eat carbs"... 
She's lovely bless her but the look of sheer horror on her face when I told her I cook with butter and even (shock horror) have some in my veggies was bloody brilliant