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I am not too well versed in regard to your ? but many others I am certain will jump in to try and help you. However, the TSH 18 does suggest Synthroid or similar I think as it is hypo .. but I'm a patient, not a dr of course :)
I wanted to stop by and [ wave ] hello and again, WELCOME to our COMMUNITY!
Cheryl - co-community leader thyroid
Yes, I think you should start taking Synthroid again. Your free T4 and T3 are at the bottom of the range and your TSH is very high. Make sure you get regular TSH tests after starting Synthroid to avoid the hyper symptoms you've had in the past from Armour.