You put too much primer on too fast. When you put several costs on in 30 minutes the coats never got a chance to dry. The very top layer will cure and form a kind of shell over the primer but won't allow the solvents in the layers beneath it to gas off (I.e. cure). If it hasnt cured in 48 hours it never will assuming you have it hanging in a normal temp of 50-80 degrees. If it's been hanging in a freezing cold garage that also wouldn't help but your issue is too many coats, too fast.
I'd sand the primer off. Start slowly putting on really, really thin coats of primer. I mean thin. You shouldn't be getting full coverage until your third coat or so, then do one more. They should be dry before re-applying. Wait an hour or two between coats.
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