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.