Hormones like birth control can cause hot flashes and anxiety too (especially if it's an estrogen pill). I'm not saying put yourself at risk by randomly stopping, of course, but a new brand could help. You might also want to check with your pharmacist about interactions.
Also, the fact that you have acne and anxiety could point to a hormone problem like PCOS or others - you might get some excellent information if you see an endocrinologist. If you do have an underlying problem, you might feel better if it were treated. I'm surprised how many doctors just treat acne instead of finding out why.
And the dose hasn't been reduced lately, I take it? Then I'm mystified. Hopefully, it will be one of those things that happens once and never again.
I have not missed any doses.
Did you, by any chance, miss a dose of citalopram? I have heard of "brain shock" symptoms from people who were going through withdrawal on other SSRIs.