Welcome to HCM,
You are suffering from Hypothyroidism
, and taking your medicines regularly this is really great,in fact this is natural supplementation of hormone which is deficient so please continue to take Thyrox as advised by your doctor and check TSH level
to keep in desirable range.
Thyrowel is vitamin and minerals required so you can take safely.
After 40 years of age as hormone begin to decline you need to take calcium supplement
to prevent Osteoporosis
You can have Hypertension
without hypothyroidism but due to hypothyroidism there is some increase in peripheral resistance which contributes to diastolic pressure rise ,so you need to keep yourself Euthyroid and take less salt and regular exercise like walking.
Please monitor BP with life style changes if it is persistently high then you may have to start low dose anti hypertensive therapy.