28yr old female. Momentary pins & needles in hands on deep breathing. Constant dull ache/creeping feeling in lower left leg. Occasional tongue tingling?

Hyperventilating? This could be due to hyperventilating - breathing deeply and quickly. Breathing in to a paper bag for a minute or so will help return carbon dioxide level to normal, and relieve the symptoms. Anxiety could lead to hyperventilating. If it is persistent, see your primary care provider for a more complete evaluation.