Dotty - If everything has been tested and nothing found to indicate why you feel nauseous all the time and unable to eat, then I'm wondering is some help from a dietician for advice might be wise? Have you been offered CBT? I personally rely very heavily on Mindful Meditation to get me through tough times.
If you can't eat, then you will feel sick, tired and very anxious. If you haven't been eating, your stomach will shrink and therefore, when you do eat, you may well feel sick. Perhaps a strict regime of very small amounts often, throughout the day, might help. Eat low residue foods that are easy to digest e..g. cornflakes with Soya milk, rich tea biscuits, in fact anything you enjoy eating - and once you start to feel better, you can then add in more food types till your digestive system is working more efficiently. When my digestive system was really struggling, I bought the ‘nutritionally complete' drinks e.g. Fortisip, to keep me going - I sipped on these over several hours, ate simple foods in very small amounts in-between and gradually everything settled as I reintroduced solid food more and more.
HRT may well help over time but you probably need a range of strategies to get you back on track. DG x