I always have low iron, last test it was 22 but because the range was 18-220 it came back normal then my GP hasn't done anything. I've been taking gentle iron but I still get stomach pains, not sure if the pins and needles in my hands are from that or fibro.

Yes I have always had low iron. Not enough to where I need infusions but I take 65mg a day supplement. I'm also vitamin D deficient and take a higher than average dose of that as well. I've not been told I'm anemic being my blood tests come back "normal" even tho everything is on the low end of the range.

The more I read about fibromyalgia its typical to have these tendencies.

My blood work always says normal but at the lower end. I take Euro-Fer 300mg every other day + vitamin C + food.
My doctor never mentioned infusion to me.

What's the indicator for you that you need another one earlier this time?

I have to have them every 12 month too

I take iron pills with vitamin c