Please do see your pdoc...even if he does recommend that you go back up on your dosages, that doesn't mean it's forever. Also, he might try you on a med that is safer to use during pregnancy. I know that you want to have another child, but I don't want to see you destroy yourself in the process...and I don't think your husband would want that either. In the end, you need to do what's best for you, and you will be in my prayers.
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From the movie The Hours: "If I were thinking clearly, Leonard, I would tell you that I wrestle alone in the dark, in the deep dark, and that only I can know. Only I can understand my condition. You live with the threat, you tell me you live with the threat of my extinction. Leonard, I live with it too."