because you gave too high dose - we add t3 / t4 only when needed, i.e. our free t3 or t4 drops below the norm or to its lower limits and we do not give more than enough for t3 to be in the upper limit of the norm and by taking 50mcg you caused yourself overactive thyroid gland and you feel unwell
Don't eat too much (will self regulate as you'll be a tad less hungry maybe). Lift and stay active per your normal. I've come off T3 a number of times... was never an issue (up to 5 months and 50-75mcg). You are correct in thinking about it but I don't know anyone for who this was an issue. Get bloods in a month and see where you are.