Hi Roobee
I definitely get this feeling at times too, but haven't "journalled it" so I could see which stage in my HRT I'm at...I will from now on though.
Agree with CLKD that eating little and often works well, perhaps some little protein bars or flapjacks would be good? Or if you're disciplined enough to weigh out some mixed nuts and raisins, or have some peanut/other nut butter on apple halves/celery sticks....
Totally agree with Hurdity (hope you're ok?) that doing too much before topping up the tank with more fuel has resulted in me feeling incredibly weak and wobbly to the point of nausea.
Hope it passes for you Roobee and you start to feel some of the good things soon!!