So the thyroid produces T4 and then turns about 80% of it into T3. So when you take just T3 it shuts the whole system down, so you are fixing one issue and creating others.
You need a T4/T3 slow release capsule between 100-180 mcg. Start with a 80/20 split, meaning 80% of the cap is T4 and 20% is T3. Play with the ratio and the dosages.
Also there is a group of people out there that only tolerate a desiccated thyroid medication well. This just means it was made from pig hormone instead of synthetically. Brand names are Armour and Nature Thyroid.
They are so popular that over the last year there has been nationwide shortages on both.
A lot of guys are fine with the generic, but you will want to get a slow release.
Hope this helps.