Please post your recent labs. Everything they did.
Oh - I meant to ask what "side effects" are you referring to?
What thyroid tests are being done on a regular basis? You should be getting TSH, Free T3 and Free T4 tested, at least every 6 weeks until levels are adjusted to alleviate symptoms.
If your doctor is testing only TSH, s/he will keep you very ill, because you don't know what the actual thyroid hormone levels (FT3 and FT4) are.
Being on that high a dose of synthroid, and still having symptoms, leads me to believe that you may not be converting the FT4 to FT3 adequately. If this is the case, you would need to add a source of T3 medication. Of course, we can only know this for sure once we see actual lab results.
Please post whatever thyroid labs you have and be sure to include reference ranges, which vary lab to lab and must come from your own report. That will give members the opportunity to better assess your situation and make suggestions.