Americans are becoming increasingly worried about the struggling US economy as home sales remain stuck in a rut and as red hot oil prices stoke inflation fears, a flurry of reports showed.  The world's largest economy has grown at a sluggish 0.6 percent pace, on an annualized basis, during the past two quarters and some economists believe a recession is on the cards.  Several new surveys on home sales and consumer confidence suggest economic concerns are becoming more pressing to Americans, who are concerned about their home values, job security and rising fuel bills.  A government report showed that new home sales rose an unexpected 3.3 percent in April from the prior month to a seasonally adjusted annual pace of 526,000 homes.