Well after nearly 3 days of headaches, I went to the docs to see what they had o say about it. And wouldn't you Adam & Eve it, they didn't really have a clue. They put it down to being run down and stressed along with side effects of the pill - useless.
"Keep taking the tablets, it should ease off in a day or two. If not then come back and we'll have a closer look".
Surely that's why I went there in the first place? Got signed off for a week tho, so some good came out of it lol.