how do you remove the driver side control arm when it is STUCK STUCK and seems rusted?

i am in the process of changing the driver side hub and cannot get the control arm to drop down out of the way so i can continue. the van has been making this crazy humming noise and serious vibrating to the brake and gas peddles when driving past 25mph. i first tried the braks, then the line, then the caliper, and nothing fixed it. so now i am trying the hub and wheel barring. i am lost and stuck with the van in the air. i have tried a pry bar and another solid steel bar. im stuck.... please help!!