RPMs too high after oil change....

I got my oil changed Saturday at the same place I always go to. Drove a short distance Sunday, didn't notice any issues. Today (Monday) I go to get on the highway to come to work and my check engine light comes on and suddenly I can't accelerate without the RPMs going up like I'm revving the engine. to go 50 mph, the tach was at 5. I plan to take it back to the place that changed the oil this afternoon but I'm really scared to drive it...what could cause this?
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Comments
Sarah, GM Customer Service
Thank you for your service to our country, and we're sorry to hear that the repair isn't something covered under the powertrain warranty. We can get you more information about the warranty, if you like. Please email us at [email protected] with your name and contact information, as well as the last 8 digits of your VIN and mileage.
Sarah, GM Customer Service