You gave your body a huge dose of hormones. It's not uncommon to get moody or anxious after you take an emergency contraceptive. You're kinda going through PMS...times a million. Even if you've never had strong emotional reactions during PMS, it's not surprising you're experiencing it now.

If it is getting unbearable in every day life, I would contact the pharmacist. But, my response to you is...it's gonna be a little weird for a week or two. Physically, you may get side effects for up to a month or two (abnormal cycles and stuff like that). You'll live...and in my opinion, a small price to pay to be protected. Take a shower and just cry if you need to; sometimes, it makes things a whole lot better.