Hi! I'm sorry to hear you're having a tough time. I often lay in bed thinking that I wasn't alone: there are so many of us going through this!
I am now 2 yrs down the track of Zoladex/ tamoxifen so can't tell for sure which is responsible for what side effects (and of course we are all different in how we respond).
I did struggle terribly with nausea but it had a pattern. Each afternoon at 3pm: I'd have to go lie in the work basement change rooms and turn green. I did finally get on top of it though after 6 months. The things that helped me were exercise (which is often the last thing we feel like), icy cold water (like one of the other posters), and ginger. My oncologist was useful in explaining 'nausea centres': and working out which one was being activated- basically I worked out in me it was the hot/cold flushing and now I go for a walk or climb stairs just before its onset. This may not help you at all, but something about the activity helped me, but non of the anti-nauseas did.
I also noted I developed arthralgia after a switch in brand of tamoxifen: there is a Nhs study which found several brands caused significant arthralgia. I switched back to genox (which has the least fillers) and was fine but my fingers and feet are I think being affected my Zoladex now so I don't think its the tamoxifen.
Hope that post wasn't too long and is helpful to others.
I'd hang in there and keep notes as you try different things, getting through the first few years is so important. Best wishes
P