Separation anxiety

My son is 8 months old, early in my sons life he wouldn’t let any one besides me hold him. Recently he grew less attached so my mom wanted to weekly visits like she’d pick him up on mondays & bring him home tuesday. That lasted probably 3 weeks & not my son is back to square one screaming his head off when ever I’m not in his eye sight even does this with his dad & one minute I couldn’t pull him away from his dad. He is breast fed with formula supplemented. I’m a STAHM so I’m primary caregiver & only face he sees all day. I’m just not sure what to do I can’t sleep alone, can’t take long showers & I don’t want any one to watch him if he’s just going to cry I’d hate for someone to do something to him because they can’t handle his crying