Does anyone get those really annoying heart flips-like a skip of a beat? Some days/weeks I don't have them and then out of the blue I'll have them a few times per day. Maybe it'e to do with adrenal glands as when I'm only mildly stressed I can experience them. Do my adrenals need testing. Otherwise coping on 50mcg Levo for underactive thyroid and ok on tests for B12-ok Vit D low and ferritin low so supplementing with iron and putting up with constipation!!! Taking Vit D supplements as Doc said only just under necessary amount.