Birth control question?

I've been taking birth control now for about a week. My doctor put me on it because of me missing periods, she said birth control will help it regulate. She told me to take it right before bed to lessen the nausea feeling. But whenever I wake up, I'm in so much pain (back hurts, breasts hurt) and there is also like a heaviness in my mouth like my tongue is swelling up. It's been doing this everyday for the past week, but it stops sometime in mid-afternoon. Is this normal?