PF SMA SINGLE PLT IFR IN CLOUDS STALLS SPINS ACFT DUE TO VERTIGO AND DISORIENTATION WHEN HE IS DISTRACTED BY HAVING TO LOOK AT NAV CHART.

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I HAD JUST DEPARTED THE TOMS RIVER NEW JERSEY ARPT AND CONTACTED MCGUIRE APCH TO RECEIVE MY CLRNC; I HAD TO CIRCLE TO REMAIN IN MCGUIRES AIRSPACE UNTIL THEY FINALLY GOT THE CLRNC I READ IT BACK AND STARTED TO CLB AND WAS HANDED OFF TO WASHINGTON; I WAS CLBING TO 8000 MSL AND WENT IMC ABOUT 5000 FT. WHILE STILL CLBING TO ALT WASHINGTON CAME BACK AND TOLD ME TO FLY DIRECT TO THE WESTMINSTER VORTAC; MY FLT PLAN DID NOT SPECIFICALLY LIST WESTMINSTER VORTAC SO I HUNTED ON THE LOW ALT ENRTE CHART TO FIND WHERE IT WAS ON MY RTE I APPARENTLY ALLOWED THE ACFT TO ROLL TOO FAR INTO A BANK AND IMMEDIATELY FOUND MYSELF UPSIDE DOWN GOING INTO A SPIN; I RECOVERED AS WASHINGTON ASKED ABOUT MY ALT; I WAS NOW VFR AND THEY ASKED IF I WISHED TO CANCEL IFR DUE TO WHAT HAPPENED; I TOLD THEM YES. UNTIL I REGAINED MY BEARINGS AND THEN CONTACTED BALTIMORE APCH AND REFILED IFR IN THE AIR AND CONTINUED MY FLT PLAN. I FEEL THE CONTRIBUTING FACTORS WERE MY LACK OF FLT IN ACTUAL IMC AND DUE TO THE FACT THAT I WAS A SINGLE PLT IFR; MORE CONSIDERATION SHOULD BE GIVEN AS TO NOT GIVE A SINGLE PLT IFR CHANGES HE IS NOT EXPECTING AND DIFFER FROM WHAT WAS ORIGINALLY FILED AND READBACK IN THE CLRNC.