Apart from the food you consume, you should also keep in mind the amount of water you drink. Drinking too much water can dilute creatinine in urine, which is why experts advise cutting back on water if you have been drinking it in excess. This is especially advised 24 hours before you are required to produce a urine sample to be tested for creatinine levels. When urine gets diluted, it lowers the creatinine amount per unit of urine. By reducing the water intake, less urine is produced. However, the same amount of creatinine will be eliminated from the body by the kidneys, meaning that there is more creatinine per unit of urine.
Two possibilities to mention:
1. If your skin is tender to touch and burning is not affected by body movements and different positions, then it can be shingles (Herpes zoster virus reactivation in one of the spinal nerves). Nausea can be also from shingles. This causes burning pain going like a stripe from the spine to the front. Often (but not always) rash appears after some time. Neurologist would tell you, if there is any available painkiler for your situation.
2. Bulging or herniated disc or some other disorder in your thoracic spine (osteoporosis, arthritis..) could cause pinched spinal nerve. This type of pain would be affected by different body positions and would not be tender to the slight touch. Again, neurologist could say more.