Alex Rodriguez was recently forced to watch his ex-fiancée, Jennifer Lopez, reconnect with her former flame, Ben Affleck, but there’s something else on his mind which is giving him nightmares. The NFL slugger took to Instagram with a message for fans on Wednesday and explained what’s keeping him awake at night.MORE: Alex Rodgriguez causes a stir with 'sad' date night photo New York Yankee's ARod teased an interview with former pro baller, David Ortiz, and admitted in the caption of the clip of