Sphenopalatine Ganglion Block Versus Occiptal Nerve Block in Treatment of Post Dural Puncture Headache

patients will receive bilateral sphenopalatine ganglion block using 3ml mixture of 2ml 2% lidocaine plus 1ml dexamethasone 4mg (on each nostril).

patients will receive bilateral greater occipital nerve block using a mixture of 3ml of 2ml 2% lidocaine plus 1ml dexamethasone 4mg (on each side of the occipital region).