I experienced that when I had anxiety issues. It was a vicious cycle as the less I ate, the less I wanted food, even though my stomach was growling. The hunger made me feel panicky, and nervous, and so it went on. I had venlafaxine XR for a while, and that did the trick for me, plus some counselling on other issues which were contributing to my anxiety.
Have you mentioned this to your doctor? It could be that an anti-anxiety drug may help to break the cycles. Or it could be a side effect of one or more of your meds.
best wishes.