WR, first thing... the Sherbourne document is to provide MDs (not psychologists) with some frame of reference for treating trans* patients. The intended audience is not necessarily equipped to make a conclusive diagnosis of GID (or gender dysphoria, if you prefer), hence this document. As Isabell has stated, we are dealing with a fairly wide spectrum here. These guidelines are not as subtle as they ought to be, but then those applying them are not trained to function professionally with these subtleties.
If you want a more comprehensive examination of your apparent dysphoria, you need to see a psychologist who has experience dealing with this state of being. I used
https://opa.knowledge4you.ca/referralsvcs.aspxto find mine, a psychologist who has helped me so much, helped me to sort a lot of things out and who was ready to send "the letter" after she had established that I am, in fact, trans. Didn't take long, really. In the search tool, I specified the "Location" and the "Problem Area" (Gender Identity Issues), leaving the other options unchanged, and the Ontario Psychological Association provided me with a solid contact.
From what you have written here, I think you are trans and you should move forward with this soon. It may be that your depression stems largely from your trans issue. Most of the darkness that coloured my life lifted after I started HRT. I am in a much better place for it. Let's just say, the need to plan my funeral is a lot less urgent these days

I hope this helps, WR. Oh by the way, this is the place to rant. We (that, by the way, includes you) are here to listen and reflect. So. Rant on, my dear, we are here for you.
(((hugs)))
-Princess Ellie of Middlesex