I was diagnosed with an underactive thyroid just over 8 weeks ago and put on 100mg of Levothyroxine. Someone pointed me in your direction and I have been following ever since, taking in all your advice and comments. Good to know I am not alone although I know it is less common in men.
My symptoms were (and still are), shoulder pain which I went to the doctor about and he sent me for physiotherapy - during that they noticed a swelling in my neck. Back to doctor who sent me for a blood test and then I was diagnosed. Cold hands and trouble getting them warm (giving blood is a nightmare as a result too!), feeling tired and not that enthusiastic, plus weight gain all them fell in to place as symptoms.
I've had an ultrasound on my neck and shoulder and that has highlighted a build up of fat so no other concern there.
My last blood tests have come back and is in range free T4 18.0 pmol/L (range 12 - 22) and TSH 1.08 mu/L (range 0.27 - 4.2). Despite this my Doctor has upped my dosage of levothyroxine by 25mg. I did mention about other blood tests for B12, Vitamin D an Ferritin and said he will ask for those at my next check up in 8 weeks (I forgot to ask about T3). The one good thing is that I have started to loose weight.