Lady Gaga has been battling chronic pain from a severe injury while on tour.The 'Bad Romance' singer has postponed a number of her upcoming concerts because she can barely walk after hurting herself more than a month ago and is suffering from synovitis, which is severe inflammation of the joints.The 26-year-old star revealed she was forced to cancel a number of her shows on her Facebook page on Tuesday (12.02.13), saying: "I barely know what to say. I've been hiding a show injury and chronic pain for some time now, [and] over the past month it has worsened. I've been praying it would heal. I hid it from my staff. I didn't want to disappoint my amazing fans. However, after last night's performance I could not walk and still can't."The pop star was forced to postpone two concerts in Chicago, one in Detroit and one in Hamilton, Ontario.She said: "I hope you can forgive me, as it is nearly impossible for me to forgive myself. I'm devastated & sad. It will hopefully heal as soon as possible. I hate this. I hate this so much. I love you and I'm sorry."The singer's beau Taylor Kinney - who she has been dating since 2011 - is hoping to cheer her up on Valentine's Day (14.02.13) this Thursday by rustling up a gourmet meal for her pet pooch Fozzi to make sure the poodle/ spaniel cross doesn't feel left out on the most romantic day of the year.A source previously said: "Taylor's making both Gaga and Fozzi medium rare lamb best pieces and mashed potatoes with gravy for Valentine's Day."He knows that Gaga would never want her precious dog, which is a cross between an American cocker spaniel and a toy poodle, to miss out on all the romance."