Day 4 - survived last night's migraine and ran this morning

So I have a feeling, I'm going to get every test in the book during this journey of mine. It's only day four and I managed to make it out to run despite the massive migraine I suffered last night. At about 7pm last night I started to get a headache so I layed down for a few minutes before supper and managed to get up to eat. But had to go right back to bed, between the hockey game playing in the living room and my beautiful princess coming to give me kisses on my forehead it was hard to get rid of the pain. I somehow fell asleep and managed to get some rest so this morning the head ache was 95% gone. As stubborn as I am, I had to run. So I ran 4.02 miles, 6.48km in 45:34, Avg Speed 8.5km/h and burned 551 Cal. not bad for the night I just had. So now this is were I need the expert advice from all you runners, personal trainers and nutritionist. Did I not drink enough water? Eat enough? or maybe my muscles are pulling my spine in an awkward position to cause such a discomfort? Even though I was diagnosed last year (after 11 years of specialists) with sacrilicious - arthritis of the sacrum I am determined to figure out this issue as I believe a 31 year old athlete shouldn't have to suffer in this much pain. I always feel good during the workout it's after wards that the problem creeps up. So I survived another day! I'll drink a lot more water and eat more often today to make sure I don't get a headache like that again.