jdaddy

Welcome.
After two years I am still learning and adjusting so take my advice with a grain of salt (actually, pun is intended).
My first thought would be it has only been two weeks and I really hate using the term, but you may still be detoxing, or better said, withdrawing. As mentioned you may need to transition vs. going carb-free cold turkey.
Second thought would be around salt. Most traditional North American diets are heavy in salt. When we give them up and purposely add the salt back in we are a tad bit short to what our body was acclimated. It could be a salt/minerals issue.
Thirdly, it could be fat content. The carnivore idea is moderate protein/higher fats. Coming off carbs and sugars is hard for the body to make that adjustment, couple that with higher protein/lower fat and it is a struggle to become fat adapted. Most people who go carnivore are not super active so the energy swing may not be quite as noticeable when compared to someone who is super busy and super active. A fall off in energy is quite noticeable.
Just ballparking, but I would also guess being super active and super busy is a chunk of the stress which is coming from the lack of energy and the 'fear' of not getting it all done. I would also think the lack of energy stems between salts and fats. The kicker is that your ratio might not be the same as mine. It may take some experimenting to dial it in for you.
Good luck. I'm two years in this month and can't imagine eating any other way. In those two years I have remained strict carnivore but have experimented with higher fats, meal timing, meal spacing and long water fasting.
Still learning.
Scott

I agree with @Geezy , perhaps your transition was too upbrupt. Check out Bart Kay's channel. He suggests transitioning over several weeks. Are you just eating the grass fed beef you mentioned? Another channel for optimization is Dr Sean O'Mara. He is big into ferments and plant phenols.

Welcome me to carnivore talk daddy.
Man, that’s a lot to digest. I’ve come across a few people that had some issues in the beginning but yours tops them all. As with most people who struggle in the beginning it could be that you just aren’t fat adapted yet and need to stick it out longer. You also may need to add some healthy carbs back in and transition slower.
I hope you can turn this around.