What Are The Ill Effects Of Overdose Of Medicine?

my tsh level is 31.7 normal is 0.3-5.0 .. when i take a higher dosage i sweat and cant walk very far without being out of breath.. I stopped taking this pill and feell much better a have a few sweats but am 50 years old and it could be menes ..my dr insist on raising MY medicene to a higher dosage but this is the 2nd time i had overdose effects.. my pharmists agrees with me. that it is too much.. Im so confussed at this point