Britney Spears Rants About Mexico Trip, Claims Injured Foot Healed

Britney Spears says she's healing all on her own after a trip to Mexico -- which she says included cursing out strangers -- but visuals of her battered foot seem to tell a drastically different story. Late Friday, the pop star posted a disturbing video of her horribly swollen right foot ... there's no way to tell how current the clip is, but in her caption, she claims she fixed it all on her own. As Brit says, "I…