First - soy is NOT good for us. It is a estrogen disruptor and most of it is genetically modified - bad and dangerous for our bodies. If you do soy, look for the NOT GMO symbol.
Tests to do: complete viral panel, thyroid (break it down so you see the T3 and T4, unbound/free), hormone (blood that breaks it down to see all three estrogens, progesterone, testosterone, free/unbound), neurotransmitters (saliva), and a cortisol (urine in most cases).
The major problem that I see with women is that one of our three systems gets in trouble and then other two overcompensate (thyroid, hormone, adrenal). You need to find out which one is in most distress and work on that to balance it out. Most doctors do just a basic blood test that will show only a very small picture of the above areas. Finding a doctor of osteopath (DO) is best as they want the reason behind the problem, not to just mask it with prescriptions.
I have a doctor I just love in Anaheim Hills if you are willing to travel some. Dr. Mary Berry ###-###-####
Don't try 'fixing' this with shakes and pills.