I've looked into the various fields quite extensively, know many people in it at all levels, and this is what I've found.
For research oriented jobs there is virtually no federal money for it, and that will likely not change, so you'd have to look pretty desirable on paper to find a job. Personally speaking, I find most exercise physiology research bogus to begin with.
The tests you took can be administered by anyone. There are many coaches and PTs out there that can administer the tests. Being able to interpret them is another story....
If you are looking at becoming a personal trainer you'd be better off keeping your job and studying for the various tests you can take ie CSCS and NCSA-CPT. People who do well in this field are good at selling themselves, which they are typically better at then training someone.
Fortunately for you there is a huge demand for nurses and the pay is good. There isn't a demand for exercise science people and trainer jobs typically pay poorly.