Your
TSH level is below normal range .As you are using thyroxin 75 mcg daily ,i assume that you are under treatment for hypothyroidism
Hyperthyroidism can also be caused by taking too much
thyroid hormone medicine for hypothyroidism. This is called factitious hyperthyroidism.
Since you have not mentioned T3 T4 levels it's not appropriate to comment on it
Next Steps
The thyroxin dosage needs to be modified ,but under the supervision of your doctor