Have you been checked for sleep disorders - these would explain the sleep & tiredness & can be caused by any number of things from stress to weight gain, sinus, hepatitis, etc.

The weight gain itself could be from an autoimune disorder - like irritable bowel syndrome - my daughter lost tonnes of weight from it but another friend gained - we're all different - also there are a number of such disorders so try researching them - start with ibs - also my daughter having lost alot of weight (about 40lbs) before finding she has ibs then went onto the scd (specific carbohydrate diet - for ibs) which hs no potato, sweet potato, corn, cakes, biscuits, rice, pasta, spaghetti, battered foods, rules out virtually all fast food aside from salad & plain chicken plus she does daily exercise for 1-3 hours yet she has now not only regained herlost weight she needs to lose about 25lb!! - so these sort of problems even when you're eating really healthy foods & exercising can create havoc with weight - we're still trying to figure it all out.

Did the sleep clinic route...Had a very very mild case of sleep deprovation...I do have sinus issues and kidney issues...Have had stones 8-10 a year since I was a kid...But I now take ucrit for those and they seem to be going away...Did the hepatitis test and was negative...Thyroid is normal...Blood counts are normal...I am stumped...

Do try doing some on-line research into autoimmune disorders (try google or yahoo) & maybe start with ibs & see if you get any leads - there are also forums for these disorders where you can ask questions about what caused weight gain & other symptoms for them.

You might also try searching under questions like uncommon causes of weight gain or health problems which cause weight gain & other similar sorts of queries.

Good luck