First and foremost, you should be asking a cardiologist about this. If I were that doctor (I'm NOT a doctor), I might do an ultrasound of your heart in addition to ECG. Do not take chances on your heart by asking strangers in the Internet!
Now, since you asked, was this taken soon after exercise, or had you been resting a while?
This can be associated with HYPERthyroidism...the opposite of what you think you have.
This could also be due to a stiffening of the aorta... atherosclerosis maybe? Are you getting plenty of Omega 3 oils?
All that aside, you really should go to a doctor (e.g. a cardiologist) and ask him/her. The difference between systolic and diastolic is "pulse pressure", which usually should be around 40. Yours is double that. That is a marker of heart disease.
Please, please, get to a cardiologist ASAP. Then come back and tell us what the physician told you.