Pink was hospitalized with severe stomach flu, but that didn’t stop her from Instagramming a picture. P!nk tweeted a picture of herself in a hospital gown, beanie on her head and an IV in her arm, all with a smile and according to her, it’s all because of the painkillers. “Maybe it’s cause my mom was an ER nurse all my life- but throw me in a gown and a hook me up to an IV-...