When Synthroid alone isn’t doing the trick my endo prescribes Armour in conjunction with the Synthroid. Approx 70% Synthroid and 30% Armour. I myself just take Synthroid but all the issues you have been having sound like what my wife was dealing with and she was doing the 100% Synthroid but now is doing the 70/30 and I will say she is a new person. She is back to her old self minus the fatigue and achy joints. She feels so much better.
I know that she had an issue with the Armour making her scalp itch which is a know side effect. I have also been told by my endo that taking 100% Armour can make your heart race and make you feel jittery. If I remember right Armour works well because it treats the T3 side and the Synthroid treats the T4 which helps balance everything out (I might have that backwards).
Good Luck-I hope you find a combination that works well for you so that you can feel normal and energetic again.
Dave