In the first place, you need to provide heat and light. You can't be dependent on the weather to keep your Tegu healthy.
You need to provide a basking area which provides surface temperatures around 110. You also need to provide lighting that produces at least UVB light and hopefully both UVB and UVA. If you are not doing that you have a serious problem that could result in the death of your Tegu.
As far as eating goes, 4 days without eating isn't critical but light and heat is. With light and heat, eating will resume.
To provide more help, please tell us about how you housing your Tegu. How large is the cage? Is it indoors or outside? Where do you live? What are you using as substrate, (bedding on the floor of the cage), and how deep is it. Is your Tegu Argentine or Columbian?
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