Welcome to the Migraine and Headaches Forum! This forum is for questions and support regarding migraine and headache issues such as: abdominal
migraines, headaches caused by allergies, cluster headaches,
headaches, headaches in children, migraine headaches, sinus headaches, tension headaches, visual disturbances.
It could be caused by the LP, as post lumbar puncture headaches and back ache are not uncommon (check out the MS page for loads of advice!).
If you headache gets better when you lie down, then you can ask to have a blood patch done. In any case, contact the clinic that did your LP, they should be able to offer you help.