@#$% pain, nut deficient and dehydrating.

My first thought from your post is either twisted ( strangled or looped ) bowel or a blockage, a hernia somewhere or maybe a stricture. I'm not a doctor, obviously, but just from your description and what I've read on here posted by other people having similar problems, and my own experiences, it sounds like those scenarios could be possibilities. Do you have a gallbladder? Have they ruled that out if you do have it?  

I'd have another CT scan done, and/or have a set fresh eyes-a different doctor-look at the CT scans. I imagine they'd need to do an endoscopy as well. 

A doc in my surgeon's practice missed what was wrong with me and another doc in the practice caught it. I had a partial blockage in my large intestine, with the upper left area being the most blocked. I had poop lining the entire length of my intestine, with distention in the upper left area. ( Sorry for TMI. ) 

In late 2014, I started with mild pain and cramps in my mid-section, especially when it was time for a BM, but after going I'd feel okay. I was regular, so didn't really think too much about it. I figured it was just "the coffee kicking in", so to speak. It went on for a couple of months with the pain steadily increasing at times and when I started looking 6 months pregnant even near my goal weight, I decided I needed it checked out. ( There was no way I could have been preggers...lol. )

A CT scan was ordered, and was called clear by the 1st do****pt having pain and was still looking bloated. I went back, saw a different surgeon and she's the one who caught the problem. ( The blockage looked dark on the scan. To me, it looked like empty space, but she pointed out why it wasn't. I think probably the intestine bulging was good indication of the blockage. ) 

My symptoms were: At first the pain would come and go. Later on it was constant with waves of worsening pain.  I'd have pain radiating from my mid-section to my back, and all up and down the left side of my torso-where the worst of the blockage was.  My stomach was distended pretty badly. I was not nauseated and I never threw anything up, but in general, I just felt icky. I was able to eat and drink normally ( even though I didn't want to ). When the 2nd doc probed my stomach area, I about came off the table. I was at the point where I could not lie down and definitely couldn't lay on my left side. ( My problems were resolved by mid February 2015. ) 

I have no advice regarding the eating and drinking since that was never a problem for me. I'm not sure in your case if it's an "I don't feel well enough to want to eat" vs. an "I want to, but physically I can not eat." situation. 

It's so terribly frustrating to know something is wrong, but not being able to pinpoint exactly WHAT. At one point, I really thought I was losing my mind. 

FWIW, the freezing cold to sweating profusely could be separate  and not related to what is going on with your stomach area. I would get that way often when I was a little over a year out. ( pull the covers allll the way up and two minutes later, throwing them off of me. ) It was hot flashes.  I'm not saying it's NOT related in your case, in my case it was not, but I know everyone is different. ) 

I hope the problem and a solution can be found ASAP.