Am I hurting my metabolism?

I'm 19 years old and I just got my wisdom teeth out this morning. I can barely eat or drink anything! It's 4 pm, I've been up since 8am and all I've had was half of one dannon light and fit vanilla yogurt with 1 tsp of flax seed. I've had a few sips of green tea and water with the medicine I took but other than that, I seriously cannot eat. It hurts so bad! The dentist told me I can only eat soft foods for the next week... my mom bought me yogurt, tomato soup, fruit juice, canned fruit, and apple sauce. I'm an extremely healthy eater and care about my body a lot and I'm afraid I'm slowing down my metabolism drastically! Will this really affect me? Am I going to lose weight from eating between 300-900 calories a day for the next week? I'm really not trying to starve myself, I just cannot eat or drink.