Jamie Foxx has opened up about the mysterious health scare that left him hospitalized for weeks and out of the public eye for several months last year, RadarOnline.com has learned. The actor, 56, revealed new details about his shocking medical emergency while speaking to fans outside a restaurant in Phoenix, Arizona. “Look, April 11 last year, bad headache, asked my boy for an Advil [and] I was gone for 20 days. I don’t remember anything. I’m in Atlanta, they told me — my sister and my daughter took me to the first doctor,” Foxx explained in the viral clip shared online on Monday. “The next do…