I didn't take my synthroid (thyroxine) med in 3 months i took it todayi got the runs, i don't know if its that or blueberries smoothy i dranked, yogurt, apple juice?

Normal: This is related to starting back on meds. Its ok just do not stop your meds for such a long time.

Synthroid/Hypothyroi: It may be from blueberries as one dose of synthroid (thyroxine) if you are taking for your hypothyroid condition, if it persist consult your doctor as a word of advice if you have hypothyroid condition and you are on replacement thyroid medicine, you have to take daily and check your blood for tsh, t4;t3 to make sure your results are in desirable level.