Hi, Welcome to Health care magic forum. 
               As your G.P. says it is not advisable to to continue the H.R.T. drugs for longer periods. 
               Now you are getting hot flushes, due to the lack of hormone in the body. In case of absence of the 
endocrinologist , alternatively you can consult a gynecologist or a physician for treatment . 
               Physician will take care of the psychological factor as well.  
               He may prescribe you some anxiolytics for relief of the 
anxiety part of the 
hives.  
               Take more of green leafy vegetables, pulses, sprouts, and protein rich foods, to have a good health,and recovery from the diseases,and resistance.                 
               Wishing for a quick and complete recovery. Thank you.