Every now and then, I get this incredible weakness and feel like I am going to drop. I start breathing really hard. I have talked to the doctor about this, he says my heart is fine (echo has been done) and he thought it is possible it is related to the onset of my period. Well today I started my period and sure enough had an episode. I don't think it is a panic attacks (I know what those are like) I checked my blood pressure and my pulse, and it was fine I don't think it was hypoglycemic, because I had eaten Any thoughts??