Hi Zoe. Sorry to hear of this. I'm glad your husband has a neurologist watching over him, as his symptoms sound severe and certainly bear watching carefully. I am hoping this all-day headache is not constant for him, every day of the month. If so, then it is beyond migraine. When I was having migraines 5-7 times a month, I took sodium valproate for a couple of years. Initially they really helped (reduced migraine frequency and severity) but after about two years, the migraines became more and more frequent and my doctor took me off the sodium valproate and we tried something else. I also had a very unpleasant side-effect of the sodium valproate: I was HUNGRY, and I couldn't stop eating, and I gained considerable weight. I lost the weight after I got off the drug, and it did help for a while, so I guess it was worth it.