Tamoxifen and Acid reflux


Been on Tamoxifen for 7 months now and most of my side effects have gone away apart from acid reflux. I’ve had all sorts of gastro tests and they can’t find anything. It started with the Tamoxifen, never had the problem before so guessing it must be that. 

Has anyone else been stuck with acid reflux? Can anyone recommend any brands of Tamoxifen that might have a less off a side effect?

Thanks very much.