Do I need more ram?

I have a HP Probook 4530s laptop with Intel i5 processor, 4 gb ram, and 500 gb hdd. It is a decent computer, but lately I have been having issues. I am an amateur photographer, and use Photoshop CS6 and Lightroom 4 often. I need to perform a lot of big tasks while editing pictures, and lately whenever I do this my computer goes to shit. These Adobe programs slow my computer down to unusable...