What Causes Hair Loss , Weight Gain , Fatigue And Muscle Pain?

I have had many symptoms for about 6 months now. They include: Hair loss, weight gain, fatigue, aching muscles and joints, 2 menstral periods every month that are very heavy, extreme tiredness, weakness, headaches, heartburn( could be from rapid weight gain ???), and repeat yeast infections, repeat vaginal bacteria infections over the course of a year. Most recently I have had 2 urinary tract infections in 3 months. 6 weeks ago I was put on Armour Thyroid 60mg for less than optimal free T -3. My symptoms have not improved. My body literally hurts all over. It is hard to sleep and impossible to do physical activities like I did last spring. I just turned 40 and I feel like I am falling apart. Can you please advise me what I should ask my doctor to test for when I return to see him. I am concerned it could be something really serious. What test should I have run?