Hi Nina,
I finished treatment (including Herceptin) two and a half years ago. I'm in the US.
I'm curious about your comment that the aching all over being due to lack of estrogen. Are you taking a hormone blocker? I thought you were hormone negative. I briefly took hormone blockers and it did make me ache all over but I've been fine since I've been off them. I was slightly ER positive at diagnosis though.
It's good that your scans were clear though. That's got to offer some relief.