Just my two cents, but 25mcg is enough T3 for what a person who has had their thyroid removed would take. I have Hashimoto's and I know thyroid. How long have you been taking the Cytomel? The thyroid gland is like any other gland. You start supplementing to the point where you suppress your TSH for a long period of time, you thyroid gland stops producing, just like testes would if you supplemented with enough testosterone.
I put a post out here earlier hoping to get a response, and still have not. I take these sites with a grain of salt. Just curious, are you a bodybuilder? I know bodybuilders (not all) take huge amounts of Cytomel because Cytomel is pure T3, which is the active thyroid hormone. Levothyroxine is T4, and your body converts T4 to T3 as it needs too. If your labs show TSH of 6.1, yes, that would be considered for treatment by an endo. And your endo would not give you Cytomel or T3. He'd give you T4 such as Synthroid, Tirosint, Levoxyl. Your given T3 for really two reasons...if you have issues where you cannot properly convert T4 into T3 (which is rare), or after you have had a thyroidectomy. Whats amazing is that you are taking straight T3 (25mcg) and still show a high TSH. I'm not certain why, but my guess is your FT4 is low, and so your brain secretes TSH (thyroid stimulating hormone) to tell your thyroid to make more hormone....T4! Not T3. Your body takes the T4 and converts into T3 for use. If you have too much in your system, you body, the T3 is converted into RT3 (reverse T3) which then causes a problem for your cells because the RT3 attaches to the T3 receptors and can't let any in.
Selenium is used for one thing....the conversion of T4 to T3. It has nothing to do with T3 getting into your cells as far as I know. But I'll defer to Ksman.
I think you really need to find out if you are truly hypothyroid. And the ONLY way to do that is stop taking any thyroid meds for 12 weeks. T3 leaves your system in a hurry, maybe two days at most. But T4 stays in your system for weeks....it has a half life of 7 days...so do the math. 12 weeks is a good number. Then have your blood tested and get TSH, FT3, FT4, Total T4, Total T3. And while you are at it, asked to be tested for thyroid anti-bodies. If they are over 35, you have Hashimoto's and your body is destroying your thyroid. Your next question will be.."How can I stop that from happening". The answer is you can't...you can only manage it...your thyroid is dying. Thyroid issues are super genetic...so if your mom or dad has it, very highly likely you will get it.
You need injections. All this crap about how to administer it in my opinion is complete bullshit! Injections work...and most docs want to inject. I know guys who actually needed it, and it was like night and day. Afraid of needles? Get over it...it's a needle. Patches, pellets, creams, gels? That's just companies trying to market a new way of administering something that docs have been doing for years.
I'm right where you are....48 years old, in great shape (guarantee I'm in better shape than 80% of the people out here), thyroid issues that are very hard to manage, and low testosterone. I'm about to go on a 3-6 month trial period, but not going to until I find out much more about it.
I'd be curious to know what KSman's background is....he is very knowledable it seems on a lot of stuff. But some of the stuff concerning the subject of thyroid I'd question. If you think thyroid is a small piece of the puzzle (not saying you do), you're wrong. There is a reason that T4 meds like Synthroid are the one of the top 3 scripts written in the U.S. year in and year out. Look it up.
Your foggy because your hypo. Your body temp will flucuate and it will never always be 98.6. Some people are normal at 98.1. Temp is a great indicator that something might be going on.