Hello and welcome to the forum.
Two weeks is absolutely nothing in the world of a snake. They can go months very easily with no negative effects.
You only mention the 90 degree temp. Is there any temp gradient? How are you heating the enclosure? And how/where are you measuring temps?
Also, how often are you offering food? Offering too often can stress the snake and lead to more refusals.
As for the tank being too small, that shouldn't stress him. However I don't see any proper hides in the pics.
Are you handling the snake?
Also, humidity in the 50s is perfectly fine.
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