I just spoke to my OB.

He said there's not much we can do in the way of pain-relief drugs, but did say that if I throw up after 10 mins, I can take more tablets, not wait for another 4 hrs.

He also said that a good option would be to come into hospital and have fluids via an IV drip - he said often if we treat the dehydration, the headache/migraine will go away.

I told him that I'd keep it as a back-up plan, as it seems a bit drastic to go into hospital just for pain - I'm not actually at risk of anything happening. What do you think?