This morning P. Diddy was rushed to the hospital after suffering a massive headache.  After partying at the Play Boy Mansion after the Grammys, Diddy started to have a massive headache.  The people with Diddy rushed him to the hospital.  Reports are saying that the homie Mr. Combs is all well and is at home resting.

Diddy was hospitalized this AM for an extreme migraine ... TMZ has learned.

The mogul hosted a post-Grammy party at the Playboy Mansion Sunday night (below). After the party, Diddy went home and got a massive headache.

Diddy's entourage became so concerned ... they drove him to the UCLA emergency room -- btw, the same place where Michael Jackson was pronounced dead.

Diddy was treated and is back at home ... feeling a lot better. A Diddy source tells us ... the migraine was unrelated to anything that went down at the Mansion.