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Hello, I'm Dr Gary. I've been practicing veterinary medicine since 2007. I look forward to helping with your questions/ concerns.
The lethargy could be one of a couple things- pain, GI discomfort, nausea, stress. That temperature is normal. Normal is 100-102. Ear thermometers typically run 1-2 degrees lower than core.
I would try to get an exam to determine the cause. Given that he's eating and not vomiting, I would probably give it 24 hours to see if the signs resolve on their own. If not, then I would get an exam. It may be that he has some neck or back pain- that's a common cause of acute "ADR" (ain't doin right). Those guys are treated with pain meds and rest.
If he resumes the vomiting/ diarrhea, then it's probably GI related and some symptomatic meds should get it under control. Let me know if you notice any other signs to help piece it together. For now, though, I'd just wait it out.
Let me know if you have any other questions.