Lyrica / Pregabalin: What dose helps you with Fibromyalgia pain?

I was diagnosed with Fibromyalgia a few years ago and experience muscle pain and fatigue almost every day. My Dr just prescribed a low dose of Pregablin -- 25mg twice a day, which she said I could take "as needed".

Does anyone else take a low dose of this drug and receive pain relief? Also, does anyone take this drug "as needed". My pharmacist said this should be okay on such a low dose.