Thank you Melissa, for all the information,
I feel you need not to increase the dose of Armour.
Given the blood levels, it seems that you are not hypothyroid now.
The pressure feeling in the chest can be due to a few causes.
This can occur in ischemia or low blood supply to the heart.
Sometimes anxiety, tension or reflux can also such feeling
Reflux symptoms can get worse at night.
The normal systolic pressure or the upper number usually is taken from 90 - 120 & diastolic is taken as 60-80 mm Hg.
Normal heart rate in an adult is taken as 60-100/ min.
Your blood pressure & heart rate are within this range.
But as the pressures are lower than usual & you have a feeling of tightness in chest, I would suggest to take an examination by doctor.
An EKG, echo, blood tests need to be taken to rule out any heart issues.
I hope this information helps.
I will be happy to assist, if you need any clarification.
Please feel free for any follow up query.