mammal,
I've never heard of heachaches being a side effect vit B6. How long have you been taking it for? Is it possible you're coming down with something? It is flu season. Don't be afraid of Clomid. Its been around for a long time and is an excellent treatment. Unfortunately headaches are a known side effect of Clomid (as I've been experiencing for the last few days)!
Good luck with lengthening that LP. Wishing you a BFP really soon!