Drink plenty of water and a glass of Lucozade Sport should be helpful. It's probably not as good as rehydration salts but it'll replenish some lost nutrients and electrolytes. When I have been in your situation I tend to find that I have to lie in bed and the really bad pain (like the one you're describing) lasts for three/four hours whilst the effects continue onto the morning quite badly and the afternoon a little bit.
I suggest you speak to a doctor about this. Laxatives, when abused, aren't good for you.
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