Our 2-year-old was sick off and on last week. Fever on Monday, gone on Tuesday, back on Wednesday. Then she slept awful on Friday and Saturday night. Slept fine last night, though, and happy as a clam today. Had her annual well-check this morning, and it turns out she has an ear infection in her right ear. Looking back at all her symptoms makes sense in hindsight, and I feel bad that she might've been suffering all this time. She doesn't tug on her ear or anything to indicate it's bothering her.
Pedi also prescribed a month of breathing treatments to see if it'll help all her awful coughing she's been having at night, seemingly unrelated to her health otherwise. Hoping that does the trick.