Princess Diana’s brother, Charles Spencer, addressed the conspiracy theories about Kate Middleton’s health and whereabouts. Spencer, 59, admitted that he does “worry about what happened to the truth” about the Princess of Wales following her abdominal surgery in January, RadarOnline.com has learned. On Sunday, Prince William’s maternal uncle spoke to the BBC regarding speculation about Kate’s whereabouts. In the interview, Spencer compared the recent “online kind of conspiracy” to the “press intrusion” his late sister was subjected to before her death in August 1997. “I think it was more dange…