I have undergone the said puncture too. After this I was advised to lay down immediately having downward slop towards head (w/o pillows of course) for about 6 hours. Sever headache started one day later and was given one Crocine tab for every after 4 hours. The headache lasted for two/three days. Horrible experience it was.
Any way, all the best. God is there to give us the strength to bear it.