2011 Cadillac Cts-stabilitrak

I own a 2011 Cadillac CTS purchased from Hennessey Cadillac, 3377 Salelite Blvd, Duluth, Ga 30096 and on Friday 9-11-15 on my way to my grandson's football game and just happened to be in the area of the dealership when my engine light came on and a service to stabilitrak appeared in my information screen. I was losing power and handling control along with almost stalling out.I was told that the Service Manager called GM for instructions and he was told to resolved by adjusting. My car does not drive the same as when I purchased it and I don't feel safe in it. What type of adjustment was made and should their have been a replacement part to insure this does not cause me to have a fatal accident if it unexpectlingly happens again in inclement weather or I just lose control or it just stalls in major traffic. The traffic is serious in Atlanta, that is why I bought a Cadillac.Please advise me how to feel safe in this vehicle. GM has lied to others and resulted in their deaths and I would not like to be a statistic.