I am having the same problem with my female gecko this month of March, and had the same problem last March. My male gecko in a cage beside hers does not go on a hunger strike in this way. I too am bringing my gecko to the vet to check-- but last year I tried every type of food and ended up force feeding her following the vet's directions. Finally she started eating on her own when the weather warmed up.

I am thinking her cage gets 5 degrees colder at night than the male's, being closer to the window. She likes her cage warmer than the male, who is happy with a warm spot of 85, while the female prefers 90. So it could be just a slight difference in lower nighttime temps causing this reaction in both your and my gecko. I am told that if it is warm enough, a gecko will eat.

One thought-- I keep a house gecko in a tank in the bathroom for various reasons, and I have noticed that the bathroom, being small, becomes nice and toasty warm and the house gecko's tank stays nice and warm also. (My house gecko has a 24-hourheating pad on a thermostat, flourescent daylight lamp on a timer, and a ceramic heat lamp on a rheostat and a dimmer.) If I could fit my female gecko's cage in there, I would do so, as I think it is the temperature affecting her.
If you have a small room or a bathroom in which you can put the cage, you might try that. Just the heat from the heating pad and any other heat sources you use wil warm up the room and keep the cage more evenly and consistently warm, which may in turn encourage your gecko to begin munching again. Best of luck

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