Hi there and welcome!
a few questions and ideas…
how often do you check your BG? from what you are writing, it seems to me that those 1000mg met are already not enough for you… what does your endo think about this? Has your endo checked you for type 1 diabetes? the fatigue and weight loss could very well be associated to uncontrolled BG.
@Melitta has written some stuff about that here
the thought of you about ending up on insulin eventually is very mature, not many newly dxd t2 are able to see that. don’t see yourself as the person who brought this unto you, but as the one working with the dx now and trying everything in his power to learn about it 
regarding your marriage i am definitely not in a good point to give advice, but mental stress also projects onto your physical health and vice versa…
good luck! hugs
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