m not sure why your doctor would tell you
to go completely off the synthroid; would probably
have been better
to adjust your dosage instead. You have to be consistent in taking the med or you will never know what's working or what isn't.
No, synthroid would not play a role in viral infections; however, if your immune system is "whacky", that could an issue.
Weight gain is a symptom of being hypo, not a side effect from synthroid.