shortness of breath- anxiety ?

Have you had any pulmonary function tests performed??
These are simple/ painless breathing tests that show lung efficiency.
Your leg syptoms sound like fluid build up/swelling. I have have the same problem there.
Ask your Doc about these.
Hope this is of some help.

Tried a NEUROLOGIST? Possible neuromuscular disease early onset, involving the diaphragm too, hence your shortness of breath, fatigue and dizziness.
Hashimoto's disease a possibility? Try an ENDOCRINOLOGIST for barrage of tests. Any ideas where the scarring in your lungs might have come from, in your medical history?
Finally, a CARDIOLOGIST might rule out Arteriovascular problems and Cardiac issues, causing possible claudications on your calf musles, and generalised fatigue you experience.
Would'nt hurt to consult a PULMONOLOGIST either.
ANXIETY? I am tempted to have doubts.
Good luck.