I know. I’ve been there.
I have experienced depression both with, and autonomous from, my MS diagnosis. I’ve always had health issues so I believe that these predisposed me to experience a deeper sense of loss, pain and sadness than had I not lived with them. The latter experience, after my MS diagnosis, is, to a large extent, still being played out. Gratefully, I do not experience depression as acutely as I did when I was first diagnosed, however, it still rears it’s very ugly head from time to time and usually with MS exacerbations.