If you have a family history, have had thyroiditis in the past and nodules - and it keeps popping up from time to time (fatigue), you may have Hashimotos Disease. I have had it since childhood. Its actually the reason I still have one thyroid lobe even though it doesn't work. The decades of attack have wrapped the thyroid and surrounding tissue in scar tissue - surgery took about 6 hours for one lobe instead of 3 for the whole thing. Surgeon thought it best to leave it in if it didn't have cancer as the nerves to my vocal chords are wrapped, making removal a pain without making me mute.
Keep up with checks, dude. Needing to go on full thyroid replacement hormone is no joke. I never fully recovered. Takes everything I have to feel like half a human being most days and the other half is just good acting
Hope it all goes well for you but if you have any concerns talk to your doc and feel free to PM me if you need anything. I'm always around.