I am glad to hear you have had a work-up about this with appropriate testing to rule out serious disorders. Unfortunately there are some conditions in which defy all measurable tests and in most cases this is good news because nothing was found to be wrong or life-threatening. Your doctor's summation makes sense because your emotional state can affect you physically and everyone responds to stress differently. You might try some stress reducing and relaxation exercises, yoga, meditation, moderate exercise, music, etc.
In some cases, mild symptoms begin to show up long before a more serious condition presents itself. Hopefully this is not the case (and I would not expect it) but even so, if your overall health is good and you take care of yourself generally, it is not likely anything you can prevent anyway. You may have to take a watch and wait approach. I would try positioning yourself in bed with extra pillows and support to try and reduce any stress on your spine. You might also benefit from an analysis by a chiropractor.
Good luck with this.
The answers in online forums are for information only and are not intended to substitute for medical advice and care. Please see your personal health care provider for further evaluation of your individual case.
Debbie Miller, RN