2010 prius egr code

good day . im hoping one of you , or more , can give me some ideas . check engine light came on last week .started losing power . starts right up . seems to have normal power at takeoff . but at cruising speeds any hill slows me down to a crawl . 50 mph on a slight grade . then picks back up on a flat . had local oil place run the light . they said egr code. tried a reset . it when its straining , wont go off . tried to disconnect power today . same results . had the head gasket done last fall . supposedly egr cleand at that time .been running great . no oil or coolant use . very little mi. since . maybe 5k .im pretty sure its not misfiring .started acting up shortly after a gas fillup .within 100 mi. got new gas today after running it down to 1/4 tank . no change . mpg is now 30 + - . seems if i back off the throttle the power trys to recover . but under full throtle trans. starts slipping . revs go up . speed goes down .... could a restriced fuel filter be the cause ? would be welcome , thnx ,bill

 

not now . i unpluged the egr and drove it to see what that would do . dont ever try that ! drove out of the drive , about one mi . now dead . says check hybrid system . had to tow it back home . so now i guess ive done more damage . welcome to my world .