I am pre-op, but I have had a constant headache for 17 months. At one point I had a spinal leak from an epidural and didn't know it because the headache wasn't as bad as my normal one and I only took tylenol for it (if that helps you gauge the severity
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I have had some success with Fioricet (but lessening), some with Topamax (but dosage is increasing) and here' what else I have found that works:
ROFLING: it's a deep, deep massage therapy. You can find a local rolfer by looking here:
http://www.rolf.org/find/locate.php3 and when you contact a practitioner tell them your situation and they usually will work on the specific area (head/neck). It really helped me and I am going to go back to my rolfer soon for another treatment. My last one was in March.
PEACE OF MIND by Origins: It costs $10 a bottle and you can buy it at the make-up counter area of any Macy's or Origins store. It is an aromatherapy lotion specifically made for headaches and it really works. A few weeks ago a friend of mine had me try it. I had a screaming headache that two Fioricet hadn't touched and one application of the lotion (you put it on your neck, temples and earlobes) gave me 1-1/2 to 2 hours of headache-free BLISS. I went and bought two bottles! I only use three drops per application and it's going to last me a long time.
I hope that helps. Headaches are horrible.