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I am very sorry for how Maddie is feeling. Absolutely, agree with your gut feeling. A week is far too long to be lethargic and off food. This is not a simple dietary indiscretion causing stomach upset. Unfortunately, we don't know if this is just stomach related, or any number of other health ailments that could be impacting the body. I definitely vote for a vet visit today, with any vet. Basic testing should include a basic blood and urine test. Also, I would suspect the vet will start some therapies to help the stomach, in case there is any nausea contributing to the problem. Also, to help stomach upset, you can give a half tablet of a over the counter 10mg regular strength Pepcid A.C. antacid.
I hope Maddie gets well soon. The basic testing will help to quickly rule-out if there is any organ problems, and the CBC (complete blood count) will help to check for any changes in the blood count or if the white blood cells are increased to suggest infection.