Can Thyroxine 150mg Cause Loss Of Concentration, Stomach Pain And Loss Of Appetite?

i took thyroxine 150mg for 6 monthes my tsh is 0.65. my t4 is 1.2 .my t3 is 2.6 lately i feel headach in middle of head ,loss of concentration,forgettness.stomach pain ,loss of appitite,strong heart beat,very thiristy.wrinkle skin and miss words ,i think it may be over dose side effect but with this dose my hormonal levels are normal ,do u think i should reduce my dose