Massie...I was struggling to start with the Tamoxifen back in Oct 2014. I thought, it stick to me for 5 years....I was struggle with long term side effect.
I had the same as you had, insomnia, fatique, bone pain (with herceptin as well), hot flush... more important - mood swing.
I changed different brand to see if the effect are the same, I took the pill in different time of a day to see if my sleep could improve, I hold an ice bag to sleep with me to ease the hotness. I didn't experienced with hot flush until starting the tamoxifen. The Onco gave me a prescirbe to work with the hot flush, but I hassle on it, I hate medicine and chemical (even panadol). It's embassarred sweat in a sudden, and my forehead with short hair, dripping with sweat. I had customer came into me, and I went into panic and sweat again. :(
It seems I can't do too much at all, in terms of work and housework. I sweat now even in an air-conditioned room.
Well like Robyn, I still new to the medicine, I hope it'll settle down little by little later on.
Take care
Rosanna