Sorry it took so long to get back. I had problems being able to read the replies. Here's the update on Midnight.....
I finally got a vet to come out, it took several days to locate one that would come out. All he did was listen to Midnight's lungs, asked me if I had wormed him & when, asked if we had given him any meds ( we had given him penicillin), he said give him 2 more doses, and asked me if I believed in miracles because that's what I was going to need. He told me that he would probably be dead in a couple of days & that was it. he said we would just be sinking money into a horse that probably wasn't worth it.
Midnight is not my horse & no, I didn't go out to look at him when he was brought to my father-in-law's house. My husband told his father & brother that we would bring him down to our barn & try to nurse him back to health. The vet did say that he was just a baby, probably 3 yrs old. He's a big & beautiful boy. Non aggressive, seemingly gentle for being a stud. We took him out of the barn over the weekend so he could stretch his legs & eat some grass. We luckily didn't take the rigged up harness off of him because he ended up falling down again & we had to lift him back up with a tractor. He couldn't get up on his own. We hasn't been out of the barn since then, we still have him tied up & supported to the overhead beam so he can't fall over. He appears to be gaining a little weight & he seems sturdier. He's not relying on the straps for support now.
I have a 2 pound coffee can as a scoop & the vet told me to feed him 4 full cans per day. That seemed like an awful lot & I'm afraid to founder or colic him, so I've only been feeding him that one full can twice a day and I started him on beet pulp with oil mixed in because his back legs seemed stiff. The vet also said to feed him all the hay he wanted. Sounded like a lot, but then again, i'm not the vet. I'll post more as we go along. It's only been a week, but he does seem to be improving. Thanks for all the comments.