Synthroid and cocktail

i've been on synthroid for 9 years. started at some low dose and gradually went up to112 mg. get extreme itching all day everyday if i don't take allegra for that.not a rash just itching. that doesn't bother me as much as the fatique. every joint in my body aches all the time. sure there are better days but fo rthe most part it's bad. tried physical therapy and chiripratic care but no avail. they ended my sessions. my legs get sooo weak and my feet burn lower back really aches. sometimes muscle cramps. i'm very negative towards my loving family and it hurts me to do so. can't seem to keep upbeat. soo tired all the time.
is it the syntroid? i used to be very energenic and a doer. now i have spurts of activity in the morning , but then i just can't get motivated. help me any suggestions?

I've been taking snthroid for about 6 or 7 years I think. I had Graves so took the radiation cocktail. Started at .088 then got to hyper so dropped to .075. The last year or so this seemed to high so went to 0.64 (half of .125) Then got SO COLD went back to .075. Now I have been cutting that in half for a couple of months but now cold again so taking 3/4 of that. I have panic disorder too so if It get too high what a mess. Any thoughts? I'm also now in menopause as opposed to peri-menopause when all this started. Yikes.