Severe back pain along with a burning sensation in the feet is usually not related to a lung allergy or the use of your Foracort inhaler. These symptoms more commonly point to issues like muscle strain, poor posture, or irritation of nerves coming from the spine. The burning feeling in the feet can also be seen with vitamin deficiencies (especially vitamin B12), nerve-related problems, or sometimes conditions like diabetes. To improve your symptoms, focus on maintaining good posture, avoiding long hours of sitting in one position, and doing gentle back-strengthening exercises. A balanced diet with enough vitamins, especially B12, is important, and your doctor may suggest supplements if needed. Applying heat to the back can help relieve pain, and physiotherapy may be useful if the pain is frequent. Since your symptoms are persistent, it would be wise to consult a doctor for a proper check-up and possibly some tests to identify the exact cause and guide treatment. Continue using your inhaler as prescribed for your lung allergy, as it is unlikely to be the cause of these symptoms.