not sure what the solution is other than to let it continue to outgass until the bad smell is all gone. keep the ceiling vent going to ventilate. keep window open too as long as you can,,,if possible to air it all out......I am surprised the odor has lasted so long. hate to think the wall paper/paste will have to be all stripped off. suggest you consult a wallcovering specialty store for advice. good luck. LJ