On the sleep eating: Have you recently starting taking a sleep med like Ambien or Lunesta? In many people it can cause sleep behaviors that you don't remember.
Both caused me to act on whatever I was thinking about when I went to sleep. It got interesting.
On the passing out when standing and weak after eating thing: It sounds like Orthostatic hypotension (postural hypotension).
Also, when your losing weight and meds you take may need adjusting. Again, a year or so ago I lost some weight (more or less against plan) and I started passing out when I stood. Left a nice hole when my head hit the drywall once. A couple of my meds needed to be adjusted downward and the problem resolved.
On the loose skin thing: There are no creams, lotions, or pills that will help. This is largely an issue of age, genetics, how long you were overweight, how much damage was done to the skin. Of course surgery can help. Also exercise to fill in some of the skin with muscle. Time also can help a little.
One last thing: You're dealing with a lot. In addition to working with your physical symptoms you may want to talk to a therapist to help you learn coping mechanisms to replace food. It can also help in coping with the other things that seem out of your control. It definitely can't hurt and can be surprisingly helpful.
Hang in there. You are your best advocate. Get the help you need and keep pushing until things improve.
Good luck,
Tek