I think I remember reading at one time that you had been treated for Lyme Disease. Have you ruled out Lyme as a possible factor in your recovery? I ask, because many of your symptoms (sore neck, MS type symptoms, air hunger) are also classic Lyme and coinfection symptoms, and many cases of Lyme and other coinfections (bartonella, babesia, etc.) take more than a conventional 6 week round of Antibiotics to clear.
I was diagnosed with Lyme disease and bartonella over a year post-removal, but am unsure myself if this is really what I am dealing with. Since the diagnosis, many of my "lyme" symptoms have gotten better without treatment, leading me to think that they were in fact hormonal to begin with. I clearly had a positive Lyme blood test and did not complete a full round of Antibiotics for either the bartonella or lyme.
Even so, I am not willing to rule out lyme as a factor in my slow recovery, and with your more severe symptoms, I wonder if maybe you should give it a look. My theory about Lyme is that since Mirena definitely trashed my immune system, any dormant lyme had a chance to get out of hand.