I just read through your whole post - I'm sorry I haven't responded before now....been taking a break from the board for quite awhile. I'm kinda shocked that there are so many views, and nobody responded?
I'm so sorry to hear about your story. I can "hear" the frustration and discouragement in your post, and I'm truly sorry for your loss. I don't have a lot of experience with thyroid disease before/during pregnancy, since mine developed after my last pregnancy. The only example I know IRL is my sister-in-law had a healthy pregnancy/healthy baby AFTER being diagnosed with hypothyroidism. She was not actively TTC-ing, but she was also not being super careful. I was surprised when she announced her pregnancy, because just a few weeks before, she had implied that her levels were off and that her thyroid condition was not stabilized. I was kinda surprised that she was able to get pregnant, and also that she did not seem to concerned about miscarrriage or complications from the thyroid not being completely under control. Since it really wasn't my business, I of course didn't say anything that might make her really fearful, but I did really encourage her to stay on top of her blood work regularly. Like I said, she had no complications, and the baby was healthy and continues to be healthy at 13 months old now.
I hope that story can give you some hope, that it is possible to conceive and have a healthy pregnancy. I hate to see you give up on your dream, but I can certainly understand how you would have fears and be so hesitant, especially since you have experienced a loss. Thyroid problems can be such a long, up-and-down journey. I really struggled with that, coming to terms that it was going to be a long journey. But now I am at peace (mostly

) about that, and so on my bad days, I remind myself that the bad days are going to pass, and it's going to be a good day soon. That might seem ridiculously naive, but it helps me.

My husband and I have not decided if we want to try for a third baby, but I have thought through the same questions you have. Do I really want to TTC, only to find out maybe I can't conceive or have a miscarriage? I can't answer those questions for myself yet, but I hope you won't give up looking for answers for yourself.