Doctors Put Speidi in No Fly Zone

Heidi and Spencer Pratt are still in Costa Rica -- but not by choice.

Sources tell TMZ the detestable duo wanted to fly out last night, but couldn't get clearance from a doctor to fly. Heidi was diagnosed with a gastric ulcer after she claims she was "tortured" by the producers of "I'm a Celebrity ... Get Me Out of Here!"

The production company behind the show says Speidi's claims are all BS -- and the tape will prove it.