Re: TSH is 16.49
I'm sorry your husband has been neglected for so long. His overmedicated state is surely to blame for a large part of his depression. You ought to consider riding herd on that doctor for his shameful neglect... or perhaps even consider switching to another MD if this one continues to ignore what can be a most serious condition. The only good thing I can say about him is that he hasn't pushed radioactive iodine therapy on your husband, the way most do.
That said, your idea about giving him thyroid for a short period won't help. Thyroid is a slow-acting hormone, and by the time it got into his system, his own thyroid will have picked up again. The combo of his own hormone plus that in the pill could push him hyper again. Don't want that.
Graves Girl (who responded to your other thread) is an expert on hyperthyroidism, and she is the one to advise about how often to get labs done. I bow to her expertise on that subject.