Ok, going to try my question for a third time... WHAT ARE YOUR TEMPS? In the enclosure, you must have some sort of temperature gage otherwise I really can't tell you for sure. You must take the temperature in the enclosure in at least the hottest location if not in two or more locations.
Mealworms aren't really the best option, has that been his only diet? Have you ever fed Crested Gecko Diet (CGD)? This is the easiest thing to do, it has all the balanced minerals and vitamins he needs, just mix with water. To feed baby food you should be mixing fruit and proteins and it can be a bit more complicated. If he has been eating only mealworms the problem could be malnutrition or calcium deficiency... calcium deficiency is very serious and could be a real emergency. Again, a trip to the vet.
I live further north than you do and our gecko doesn't even have a light, simple sits next to the leopard gecko enclosure to get some light. We don't use a heating pad save for 3 days when the heat went out. Again, I NEED TO KNOW THE TEMPS. Those heating pads get very hot and anything over 85F is a problem. The gecko can burn himself without realizing it and you have to be very careful.
Get yourself a good caresheet ASAP, I would suggest crestedgecko.com has very detailed information and they are in wisconsin so you know it will work for you in the cold. Please do some reading and take the little one to the vet if it still hasn't eaten.
-----
0.1 Albino Leo Gecko
0.1 Crested Gecko
1.0 Dear Boyfriend
Departed: Harvey and Spock