Well...... poor pussy should have gone to the vets by now, I have to make sacrifices when my pets are poorly, there are many reasons why your cat may be limping, i have seven cats and when one of my cats was limping i took her to the vets after 4 visits and a lot of x rays later it still showed nothing, conclusion was a deep bone infection, �400 later metacam,and antibiotics given cat is now fine, other cat had a limp for 8 months the vets thought it was a balance related condition....she died 3 months later through FIP,
so GET to the vets and get it checked out