We had are still having a recession in 2008. While we were in the EU.
Project Fear want us to believe that recessions only happen outside the EU - plain bunkum. Have you noticed also that despite the recession we are still here and functioning. It's not the end of civilisation, like Project Fear would have you believe.
However if you want total meltdown, ask the Greeks what that feels like. I don't see EU membership offering them much solace.