Spinal Tap to identify unknown Headache.

I have undergone through spinal Tap - CSF pressure monitoring (CVP manometer). After the procedure doctor said no issues identified. Everything is ok. Take Naxdom 500mg when you get headache he suggested. After the procedure I was in bed for only 20min. After that I went to home. In 48hrs, headache has been started. When I stand and sit headache is coming. If I sleep no headache. I think it's post headache after the procedure. Usually we need to be on bed for atleast 2-4hrs after the procedure, but in my case only 20 min. Please let me know if that's a issue. Now I can't sit or stand. I have taken Naxdom 500mg to relieve from the pain. Please let me know what shall I do now to completely recover from this lumber puncture post headache? Is this going to be a health issue in future ??? Please answer and help me sir/madam. Thanks in advance.