I can't say it's exactly the same, but when I'm about to get a migraine, I get the same thing - dizzyness, muscle weakness and a little trouble breathing (just a tiny bit labored). When I get migraines, it's usually in response to something I've eaten that my body isn't thrilled with and sees as a threat.
When I first started eating primal and ditched the sugar/grains, I would be a bit lightheaded (I walk all day, so I'm not sure about standing) and the muscle weakness along with feeling sluggish. After my body made the switch, that all ended. But if I eat wheat, especially for more than one day, then I get all of those problems again.
As far as the weight loss goes, yeah, men suck. Their bodies tend to let go of fat faster than women's bodies. Just how it is. But you could also be getting leaner while staying the same weight. My boyfriend could tell I was leaning up before I could because the scale wasn't moving but I looked better.
Your food intake looks good, so I have no advice on that.