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.
Think about this, if you poke yourself three times per week on a typical eod schedule, you are barely getting 200mg of testosterone in your system for the week (68 x 3 = 204). If you took 3cc’s of either phenylprop or prop per week you would be getting 204mg of pure test from the phenylprop and 252mg from the prop. The names sound very similar, they act with the same speed of release, but their potency is totally different. The 48mg difference (252-204=48) per week represents roughly 24% of the total phenylprop and 19% of the prop amount of pure testosterone in your system. In functional terms what this means is that using two drugs which are suppose to be similar actually equate to a 1/5 difference on the low end and a ¼ difference on the high end with respect to your total weekly dosage. Don’t you think increasing your dosage by 20% is significant? How about getting a minimal of a 20% DECREASE------YIKES. We all know decreasing dosages is so much fun----YEAH RIGHT!! But this is what happens if you take equal amounts of these two drugs. You will get about 20% more active, pure testosterone in an equal amount of testosterone propionate than testosterone phenylpropionate. I hope we are all on the same page, this will be a recurring theme on this site due to its importance.