Please re-read my original retort to Avi. I do not subscribe to the view that some have in mistaking Yiddish for the language of the oppressed but was merely mentioning it.
As for the dialect in Suwalki: Before the War, there was a sixty-five-mile borderland between Poland and Lithuania where Suwalki is situated. In that very small geographic area, the Jews would say “oyf” rather than “uf” or “af.” It was this pronunciation upon which the artificial כּלל-אידיש is based. It is interesting that you mention Suwalki because the kehilla there was quite modern and even cosmopolitan. The Haskalah made major inroads in Suwalki as it had done in places like Lwów.
Also, דאגה is written with an אל”ף.