I went through something very similar. I was given 2 epidural and the second of the spinal block never worked. So I would have been better off with out the epidural all together. I went home and the next day had the worst headache ever. It was a migraine that put me in the bathroom throwing up and sleeping on the floor. I tried all the OTC meds...NOTHING worked.
Then I went down the natural path and tried chiropractic visits. This did seem to help and generally dull the pain.
The receptionist one day pulled me aside and asked how I felt about medical marijuana? I was a little shocked, but kept an open mind and said I will try anything to get back to being myself. She hand me what looked like an electronic cigarette. It said green sticks on it. I took a puff and didn't feel anything. She said to keep puffing, I did and it was like something clicked. I felt the pain dissipate. I asked her if I could buy it off her and she said she really shouldn't because you need to be a patient for it to be legal. I convinced her to let me borrow it for a week until my next appointment. It really helped me! I used it anytime I felt a tinge coming back and it worked! I truly believe that damn epidural did some damage to my nerves and now I use the Green Stick to keep them from getting aggravated. I am just glad I can get back to my main focus, by baby!