I had a lumbar puncture 4 days ago, I am female, 5ft 8 and weigh just under 8st. Ever since the procedure I have had a headache which progressively has gotten worse. Yesterday I could not even stand, the pain is excruciating and when I tried to go for a walk yesterday, I broke into a sweat and started shaking and being sick about 5 times, plus being incredibly dizzy. I am finding the pain very hard to deal with, but I was told this could happen...how long should I expect this to last for and besides lying flat and caffeine, is there anything else which would help?