Levoxyl and 6 years

I was on Levoxyl .175 for 6 years and found it was the only one that worked for me. I do have pain in my joints ,but defiantly have arthritis, I have anxiety and panic but have had this stuff my entire life. About 4 months ago my doctor had me cut my .175 in half despite my level was in the normal range,all it did was wack my thyroid out and now my TSH is 18.4 .Instead of giving me my .175 back he felt I may be getting to much with it (though my levels were always normal on it) and put me on .100.
I did notice when he changed it,I felt nervous and bad for a week now its been 2 weeks and I feel like I always did so far the only difference is im having trouble with constipation and stomach pain and I have nausea ..Not sure though if its the Levoxyl or something else going on.

I have been taking Levoxyl for 1 1/2 yrs, I had my thyroid removed due to severe hyperthyroid. In the past year, I have been getting pains and weakness in my hands. It is so bad now, I can't open a jar or lift a frying pan. It hurts sooo bad. My legs hurt and my knees have real bad joint pain.
The funny thing is, it's not every day and not always both knees. It is however all the time in my hands. Last week I went to an Arthritis specialist in San Antonio. He ran every blood test avail. Tested for Rhum. arthritis, Lyme disease, AA, and all kinds of stuff. He x-rayed my knees and injected cortisone in my knees and hands. - that hurt -
He found nothing wrong!
I searched on line tonight for "Levoxyl and joint pain" and this site came up. Boy am I glad I am not the only one who is questioning this horribly possible side effect. Oh, I also have memory loss. I feel like I am 80 yrs old. Just to make sure you know what type of person I am, here goes: I am fit, active, 37 yrs old and 115 lbs, I eat well and take vitamins, non smoker, non drinker.
On Monday, I am calling my doctor. I am printing this web site and all of the postings like mine. There must be something I can be put on that will fix this. Can anyone tell me if they have no Thyroid and have gotten off this stuff; does the hand pain stop? Does it get better or is this permanent damage?

Kerrville TX