I understand the frustration of the OP, @Muhammad Umer. You very well may want to contact WinSoft, for they make many tools to help Arabic, Hebrew and other languages comprised of symbols flow correctly. The bulk of the issue for Adobe, I assume, is that they concentrate complex text, H&J's and language controls within InDesign CS6.
InDesign would likely be the answer to how to best layout Arabic text. Place the Photoshop image within InDesign and design/layout from there in Arabic or the language you need to use. With the Worldready plugin from InDesign, this is largely possible, yet still many opt for InDesign ME from WinSoft for deeper Middle Eastern language and text layout control.
That said, Adobe does have tools and even a special "layer" PSD file to help specifically with Arabic or right to left flowing languages in Photoshop. You need to change your language settings in Photoshop and indeed need the proper fonts and keyboard (or keyboard overlay), but it is possible. See: http://forums.adobe.com/message/3407321
I hope this helps.