I have had a bad headache too! I went to final pre-OP this morning at hospital. Met with PT and anesthesia and they explained the nerve block, spinal,and regional,and said I would be in "twilight " sleep... But I have to go earlier tomorrow for a pic line cause of bad veins... So imhave to be there tomorrow at 10 AM for 1:30 surgery! And I am freaking out right now!!