Ain't having nNothing to write onabout.

"Ain't" is technically grammatically incorrect, though it can be used in very colloquial conversations. In such cases you could say, "Ain't got nothing to write." However, this style of speech is often associated with a certain region or demographic, so I suggest you not use it. It's weird at best and offensive at worst.

Well, as you see you, I'm basically in th, I have "writer's block" state.

I have nothing in my mind to get a feel to write inspiration.

If you want to keep part of your original sentence, you can say, "Nothing comes to mind when I (try to) write" or "I don't feel like writing anything" or "I'm not feeling inspired by any topics."

P.S. It's mythe second day streak ofof my writing herestreak.

Well, as you see youcan see, I'm basically in the "writer's block" state.

I have nothing in my mind to get a feel idea what to write.