A family source tells PEOPLE that the Grammy winner's diagnosis has "brought clarity to a series of unexplained issues" as Biel has been "incredibly supportive"

The diagnosis of Lyme disease has brought Justin Timberlake "clarity". Earlier, Jessica Biel "felt like something was off" with his health.

Justin Timberlake said he's "not doing s--- today" after wrapping up his two-year international tour, during which he was diagnosed with Lyme disease.