Baby headaches?

My 4 week old seems to be very cranky and can't sleep today. She also sounds like she has a stuffy nose, but she still has big boogers stuck in there. She has been sick the last 2 weeks and has been on a nebulizer for 8 days. She still sounded congested yesterday but she was so happy and slept great yesterday. Today she just wont sleep more than 20 minutes or so and when she wakes up I can't seem to please her. Could she have a headache, maybe her head just hurts and that's why she just seems like I can't please her. She eats like 1/2 ounce when she wakes up every 20 minutes. She screams like she's starving though and then she only eats 1/2 ounce, but then sometimes she eats 3 ounces at a time. She may have a belly ache but i've never heard of a baby headache...I guess they could be real...they're just as human as we are.