Dear Jodie,
It must be hard dealing with your husband's illness.
The medication you mentioned, Remeron, is an effective antidepressant. Common side effects are sedation and weight gain. It is difficult to determine the reason of your husband's medical findings without proper physical exam.
Continue to follow up with your physician, you may also consider a second opinion.
My best wishes for you and your husband.
HFHS M.D.-SW
http://www.ncbi.nlm.nih.gov/htbin-post/Entrez/query?uid=10434798&form=6&db=m&Dopt=b
(you can just cut and paste this into the location bar on your browser).
You're welcome and all the best!