Your thyroid can affect your blood pressure for sure because the purpose of your thyroid gland is to literally balance everything in your body
including your blood pressure.
It was not until my thyroid stopped producing properly that I ended up with hbp.
A lot of people associate low thryroid or any type of thyroid problem with OLD AGE. That nonsense is just that, "nonsense". My dental hygienist was diagnosed with a thyroid problem at age 10. Her blood pressure was sky high.
Thyroid is very easily treated with a tiny hormone pill daily.
As far as lowering your blood pressure naturally you can do several things, stop taking in a lot of sodium filled foods, eat garlic or take garlic supplements, celery seed extract, and hawthorne berry are also supposed to be very affective.
Your doctor wanting to check your thyroid is very wise - you have to start with the thyroid first to check out many things since it affects and balances everything. Interesting lil organ.