When I was at my worst I lost my appetite. But then you feel sick because you are not eating, then you can't eat because you feel sick. It becomes a vicious circle.  I agree with CKLD, grazing is the answer. I used to nibble on pretzels, apples, sweets, flaked almonds, even if I didn't feel like them. 
Once the HRT kicks in you will start picking up. 
LM x