Defintly symptoms and conditions

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 began taking this medication at 100mg twice daily for a sinus infection and have experienced negative side effects. I actually experienced side effects and then decided to check the side effect listings for the drug online and they defintly match. I have experienced extreme dehydration, nauseau, headache, disorientation, drowsiness, and stomach pain. I have not experienced vommitting but have felt close to it. I have also experienced a loss of appetite.