possible bad motor mounts? Options

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this only happens when im in gear and trying to accelerate after shifting. frickin whole car wobbles like a b*tch through all 5 gears. i could feel the driver's side door panel vibrate like it's going to fall apart. i replaced the spark plugs, wires, blah and it drove fantastically for a month or so before this. i think it's the motor mounts but have never had it actually happen to me. i see on the passenger side mount it has a opening as if a bolt might of came off any ideas on how to check if they're loose or just bad? i see no cracks but ill check early tomorrow morning again.