Wondering if any one can help

I have been having Zoladex injections for the past 6 months and have been getting hot flushes mainly during the night.  My doctor suggested evening primrose oil which has helped but not greatly. I am finding between the hot flushes, the steroids I receive on chemo days and the general sied effects of treatment sleep is hard to come by and I too am tired and tend to have a nap most days.  I  also find that exercise helps with the tiredness and we do try and get out most days for a walk which has been a bit challenging in Melbournes recent hot weather.