horrible migraine day 3!

Can someone please help me, I'm 22 weeks today & I don't know if it's because my boobs are so big an it's hurting me neck, I don't have a proper fitting bra; or if something is like wrong iv had this horrible migraine I haven't taken anything for it because I just don't like taking pills, an it's gotten so bad I have no appetite an it feels like someone hit me in the back of the head like it just hurts so bad!