If what you are recording is correct then you are getting pretty low levels of sodium (especially today), which might be why your bp is low (too much sodium can raise bp, the opposite is also true). Also, a symptom of too little sodium is feeling sick. If I'm remembering correctly, you shouldn't be getting under 500 on sodium daily minimum. I would suggest seeing your care provider about it though, they can tell you what may really be the issue better then I can ;-) Hope you feel better soon.