I am constantly give out... and I mean extreme tired... and nausea off and on... My iron is always low.. for at least over 2 years... platelets have been low too but is doing better.. I have micro-vascular heart disease and stage 3b kidney failure... was a stage 4 but it came up a little last week... I also have left branch bundle block but no blockages at all .. none.... and diastolic diffunction....cardio myopathy.... congestive heart failure... ischemia... most days take at least a couple of sl nitro. I am on long acting nitro.. Ranexa and Toprol... for heart.. I have pernicious anemia and I take a shot every 2 weeks... and my B-12 levels are really good right now... but this extreme exhaustion and short of breath which I know I have a lot of short of breath because of heart... but I now am seeing a hematologist and she is doing more test... so all this short of breath with this extreme exhaustion and nausea is really getting to me.... I have always been the one cleaning and working in the yard all day and loving every minute of yard work... now I don't even have the energy to pick up grands toys off the floor... what else could this be...