The pain is usually because of low Hb, I believe. And yes, I too take Evion (Vit E brand in India) and I feel it helps me a lot. It also helps me get away and saves me from any fatigue and restlessness.
About Hb, usually, if and when, sometimes, I've low Hb, like 8 or so (in very rare cases), my legs and joints do pain, which after TX, on the next day of it, are much relieved. So yes I do believe there is some connection of pain due to Hb levels being low.
-P.