My Husband Is In Rehab. He Has Had Pneumonia3x And

My husband is in rehab. He has had pneumonia3x and the flu before that. He lost a lot of weight all of sudden and in the space of less than 2 weeks he was incontinent and couldn't hold up his own weight. They thought at first he might have lung CA but did ct and pet scan. There was a place about 5 cm but the radiologist finally said he didn't have it. His bowel incontinace has stopped but not urine. He can barely get out of his bed and he has been there getting PT everyday. Please help me. I don't know what kind of specialist to see first. Thanks. Wanda