Just received a 1099g after return was accepted

My return was accepted on 1/13. I filed for eitc. I just got a 1099-g from unemployment today that didn't get reported. I didn't pay taxes on it. I'm assuming my return still says it's processing because of it. So, what happens next? Am I going to have to wait months for them to do anything? Am I going to just be made to ammend the return? Will they reject it and let me e-file again?  I'm already frustrated that a government agency sent their tax forms almost a month later than allowed and I already had to wait over a month because of the path act. It does lower my return by almost 200 dollars.