I won my unemployment case via phone hearing & ER is now suing me and the Dept of labor- Can I counter-sue for mental stress?

I am literally about to have a nervous breakdown- I am looking for employment daily and need a job- I just got paid for the employers portion (which I was initially denied) and am barely getting by. I just received a summons from the employer who is stating that the decision was erroneous and should be reversed- I know I would have to pay back the money I just received and I cannot afford that! I just used it to pay bills- plus I already have medical issues for which I am now paying $600+ a month just for insurance and I pay roughly $100 in Dr. appointments and meds per month. I am still out of a job after 3 months, used that money to get caught back up on bills, (which is stressful enough!) and now they want me to pay it back?? Can I counter-sue for undue mental pain and suffering?