Everything ive read says after blood patch instant relief. had a c3-c5 plate fusion Dec 2013. Same symptoms came back and dr ordered myleogram last week. The MOST horrendous thing I've been through. Spinal headache so bad still at day 4 so did a blood patch. Today 24 hrs and still headache and ringing in 1 ear. DEFINITELY better than was but why still headache and dizziness when I stand?