I was taking thyrolar 2gr for over 35 years until the pharmaceutical company stopped making it about 1 1/2 years ago. Doctor switched me to Levoxyl 88mcg. I don't feel the same. I've gained weight without changing eating or activity habits. My skin and hair are drier. I feel tired more easily. I am 70 years old if that matters. My doctor says blood tests results show that my thyroid is functioning normally, but something feels different and I don't think they are testing both the T3 and T4. Should they be? Do the two thyroid medications work differently?