Thanks Jdakic, I only just saw your reply. I got too nervous about coming off the tamoxifen even though it seems stupid to worry about 2% increase in the chance of dying. So, I'm back on it for now. I'll need to go over all the pros and cons again properly next time when I've had even more time to think about it.
I like what you said about "going outside of stock standard treatment" - that's exactly it. If I go against even the slightest of their advice and then I got cancer again it would be so unbearable to think that maybe it was my fault.
My period came back today so now that will presumably need to be factored into any decisions. It is also extremely annoying.