Pain -right muscle above the chest to the shoulder. Like muscles used to pull a lawn mower have high blood pressure & a heavy baby I carry most days?

Probably muscle stra. It seems most likely you have a muscle strain. It is unlikely this relates to your blood pressure, but might have something to do with your "heavy baby". Perhaps you need to find a way to carry the child other than the way you are accustomed to, or switch to a stroller. If this gets worse see a physician to make sure you don't have a problem in your neck with a pinched nerve, but i doubt it.