VERY EXPERIENCED BE200 PLT EXPERIENCED DISORIENTATION AND LWOC AT ISM.

Narrative

LANDED AT THE ISM ARPT WITHOUT LNDG CLRNC. WE LEFT ILM JUST AFTER 10; WENT TO SPA; WAITED FOR ABOUT 2 HRS. LEFT FOR LAL. JUST BEFORE WE GOT TO LAL I BECAME VERY DISORIENTED. THOUGHT WE WERE LOW ON FUEL; LANDED IN ZEPHYRHILLS; FL; TOPPED OFF THE INBOARD FUEL TANKS; OUTBOARDS WERE FULL. DEPARTED ZPH FOR LAKELAND; FL. AGAIN BECAME DISORIENTED; COULD NOT INTERP THE COMPASS OR GPS. I WAS CIRCLING AROUND WHEN I SAW THE ISM ARPT. DECIDED TO LAND. UNTIL I GOT ON THE GND I DID NOT KNOW WHAT ARPT I HAD LANDED AT. HAD LANDED WITHOUT CALLING THE TWR. I HAVE ABOUT 1500 HRS IN THE B200; JUST OVER 15000 HRS TOTAL TIME. THIS WAS MY FIRST TRIP IN THIS ACFT. THE ACFT I REGULARLY FLY HAS A HONEYWELL MFD; WITH A KLN94 GPS. THE ACFT I WAS FLYING YESTERDAY HAS 2 GARMIN 530'S AND AN AVIDYNE MFD. ALSO A DIFFERENT AUTOPLT. MY FIRST THOUGHTS ON THE CAUSE FOR THIS WERE THE ANTIHISTAMINE I HAD BEEN TAKING FOR A HEAD COLD OVER THE WKEND. ON MY DRIVE BACK (CAR) TO NORTH CAROLINA; I EXPERIENCED SOME PAIN IN MY L KIDNEY AREA; ALSO EXPERIENCING HIGH FEVER. UPON MY RETURN; CALLED THE UROLOGIST. AFTER ARRIVING AT HIS OFFICE FOUND TO HAVE A TEMP OF 103 DEGS. HE TOOK X-RAYS; IMMEDIATELY SENT ME TO HOSPITAL. ENDED UP STAYING IN THE HOSPITAL FOR 4 DAYS MAINLY FOR THE COMPLICATIONS OF THE HIGH TEMP. THE DOCTOR INFORMED ME THAT THE DISORIENTATION WAS PROBABLY CAUSED BY THE HIGH TEMP.