You didn't mention your age here. Are you on any antihypertensive medication
(medication which controls blood pressure)? If it is amlodipin then there is chance that this is the reason that your heart rate
goes up, but you shouldn't feel symptomatic with that this badly. Your TSH
has gone down sometimes below the normal range and now it is going in upward direction. May be you are having a condition known as 'recovering thyroiditis' where after a few weeks' time you might develop mild or full blown hypothyroidism
. Hence your FT4 levels are showing downward trend. And this also can be the reason for your irratic symptoms. If your symptoms worsen, please see a GP and do get your TSH and FT4 repeated after about 6 weeks to know where you stand and whether intervention is necessary. Take care. Revert back for any further queries.