As your whole body changes during pregnancy to accommodate the ever-growing baby, it's quite normal for extra stresses and strains to be placed on your pelvis/spine/upper body. Some of these areas might have had minor problems in the past but your body coped OK, however now with the added changes of pregnancy these 'minor' problems become harder for your body to cope with. Your body will compensate for alot of things, but if your whole body is under pressure then this can lead to a "corkscrew" effect with lower back problems transferring to upper back, which transfer to your neck and shoulders, which then transfer to your head leaving you with a whopping headache/migraine.
The chest pains could just be due to extra pressure on your rib-cage/upper back but I'd get it check out just in case.
HTH
ETA: if you get the chest pains OK'd by your doctor, I'd be heading to see an osteopath or physio to help you with the musculoskeletal problems.
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