It definitely looks like a complication of LP.
It could be an infection at the LP site, arachnoiditis, benign intracranial hypertension, herniation of tonsil or spinal headaches. Also, the infection could have cause a flare of extra-intestinal Crohn’s. Since a confirmed diagnosis cannot be given on net please consult your doctor regarding this (immediately please). Hope this helps. Take care!
The medical advice given should not be considered a substitute for medical care provided by a doctor who can examine you. The advice may not be completely correct for you as the doctor cannot examine you and does not know your complete medical history. Hence this reply to your post should only be considered as a guiding line and you must consult your doctor at the earliest for your medical problem.