MY HUSBAND HAS BEEN LOSING WEIGHT. HE IS 6'2" AND

MY HUSBAND HAS BEEN LOSING WEIGHT. HE IS 6'2" AND 165LBS. HE IS TIRED ALOT. HE SAYS HIS FOOT HURTS AND WHEN HE IS LAYING DOWN, HE WILL STOMP HIS FOOT ON THE FLOOR. HE HAS FALLEN 3 TIMES WITHIN THE PAST 10 DAYS. HIS FATHER DIED OF CANCER 25 YEARS AGO. HIS MOTHER HAS HAD BOTH BREASTS REMOVED. HIS NEPHEW DIED OF BRAIN CANCER 7 YEARS AGO. I THINK HE IS AFRAID TO GO TO THE DOCTOR BECAUSE OF WHAT THE DOCTOR WILL SAY. WE HAVE A 15 YEAR OLD SON AND I'M REALLY WORRIED. WHAT DO YOU THINK HE MAY HAVE?