If there was no food intake for that long and the animal is only 55 grams which is merely the weight out of the egg I would rule out fecal matter however depending on how it feels it can be a few other things.
If the lump feels soft gas are the likely issue.
If the lump feels hard dehydration and blockage due to a large dry out piece of urate is likely the cause.
While those can be assessed and taken care of at home it should be done by one with experience, and this will set you back as it is stressful.
Other option would be an issue with the digestive track which could explain the lack of feeding.
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