New to NDT/chronic joint pain

I switched from synthroid to Naturethroid in May. I was on alternatate doses of 62.5 & 75 mcg synthroid. I wanted to start slowly on the Naturethroid, but I just started on 68 MCG. Ever since starting on NDT, I have had terrible fatigue and joint pain. I just got my labs done and don't know the results, but am wondering is this just maybe a sign of hypo and needing more or is this a side effect of Nature Throid? I am 44 and feel 85 in the mornings!