I’m glad that you’re feeling a bit better than this morning, hopefully that’s you on the mend now!
I had a terrible headache following my LP in May, it didn’t start until at least a day later despite me having following the instructions to lie flat and drink lots of caffeine drinks. It was awful, I was fine while I was lying flat but felt like my brain was going to fall out of my head whenever I lifted my head or got up, felt sick and dizzy too.
I actually lost my hearing 3 days after the LP so called out the GP and ended up back in hospital. I had read about the blood patch that can be done but my hospital told me that LP headaches can last up to a week and that although blood patches were generally successful they didn’t like doing that unless the headache went on for longer than that. It turned out the hearing loss was a really rare side effect of the LP, something to do with one of the cranial nerves which float in the CSF being disturbed.
Anyway my hearing came back a couple of days later, I was laid flat for 7 days and it took me another 4-5 days to recover completely. It was worth it in a weird way because it came back positive.
I hope that you continue to get better but if you’re unsure/concerned you should really call your GP or the hospital as the others have said, for some reassurance if nothing else!