Honestly, I couldn't tell you how many times I have felt similarly, and there are many other pnqers or friends I have that also write or create in even more publicly viewed places who also relate. You have done a fantastic job getting every aspect of sitting with a pen and wrestling with your content translated wonderfully into a beautifully heartbreaking piece.
I believe every writer can relate to this at one time or the other: the writer's block; and you have made your inability to weave words to form a string of beautiful lines of poetry. It is beautifully crafted, wonderfully portrayed and connects with the reader very well (it did with me). Do keep writing.