I agree with soz--and Noddy.
No matter who actually wrote this, I'd already written my criticism.
To wax and wane in undignified solitary,
"Wax and wane" are used frequently, and as soz suggests, they are generic terms that need to be added to another thought, if this line is to be communicative. Poetry, in the opinion of some, is a free-wheeling, free-style communication. Your words don't have to be grammatical or traditional in the context you use them--they just have to say/communicate something worth saying.
This poem hints at a mood, but nothing more. (To me, anyway.)
I liked your use of "undignified", but again, even
that has become cliche --You seem to be expressing the inexorable passing of life as solitary and undignified.....but all the lines seem to be saying the same thing.
What about all this sadness and loneliness?
To gasp and breathe with out mortal feel,
(Something about this line, I liked. Maybe the language barrier worked in your favor with this line, or maybe I'm having a weird day. Something about it is raw. It's a twist on being able to feel touch--it also denotes to me that you also can't reach out to touch... I think it was unexpectedly touching....

(Translation: She liked it.)
a decadance of no slumber nor rest ,
(This line wrecked the others for me. It seemed fake and presumptuous with
decadence, in addition to being the third line on what I felt was a singular feeling. This is the line to expand on your thought process in the poem.
What about solitary loneliness???
a tide of lonliness and sorrow
Expand on your imagery and your thought.