Tamoxifen Milpharm brand

Hi

I've just swaped brands from Wockhardt brand to Milpharm and amtthaving very bad headahces, sore throat and neck pain.  I had none of this on the other brand but have been told it is no longer avaialble.  Is anyone else on this brand?  Only been taking it for 6 days but feel side effects are awful.

Thanks,

Sandy