I agree with Red. It struck me that you might also get some useful info from my post to cadaeyes.
Have you had full thyroid tests lately? You sound like you are hypo, but you can only know by having TSH, Free T4, Free T3 and anti-bodies testing.
Having a partial usually means the other side picks up the slack, but after time the side that is left can fail.
You need to get tested again and see what is going on.
Cheers!