I am going through the same thing with Abbey. She, too, has the symptoms you describe and has also lost several pounds over the course of the past 5 months (despite eating better than me!). I can't remember what her previous testing results were, but this test showed her 'low normal' for greyhounds. My vet and I decided to start her on a very low dose of soloxine to see if it helps thinking she may do better with higher levels. It's only been two weeks, so we'll see!
Good luck with D.C.