If you are seeing a primary (general practioner ) I would suggest seeing a internal medicine Dr. Or an endocronologist.

Have you been tested for low blood pressure, or diabetes ?
**************************************************
Some of your problems may stem from hormonal issues. Have you had a FULL( complete ) exam by a gynocologist? Some of these symptoms sound like pre-menopausal symptoms to me.
***********************************************
Perhaps a change of anti-depressants should be in order. There are several different kinds of course.
**************************************************
You comment that the hot flashes aren't related to any "usual" female concerns. How do you know that ? Has a Dr.told you this ?
**************************************************
Have you had your gall bladder out ?
***********************************************
Have you seen a Ortolaryncologist (Ear /Eye/Nose & Throat Dr.)?
************************************************** ***
Perhaps a daily IRON tablet, a mulitvitamin, might help you.
************************************************** ****
This might sound "crazy" to you, but how many times do you eat per day ? If you are only eating 1 or 2 times per day, your metabolism is either non-exsistent,or really sluggish. In other words, eating 5-6 small meals per day (with at least 6 glasses of water ) would help you to lose weight, and might make you feel better.
Continue to seek an answer....you never know when someone might help you