Thank You-My Friend Is Under A Great Deal Of Stress

Thank you-My friend is under a great deal of stress on her job and is saying that she has the following symptoms-metallic taste in her mouth and a tingling-like sensation or "like when your foot falls asleep" feeling and nauseousness throughout the day...... do you think it can be anxiety causing these symptoms? She's seeing a dr. and trying to get to the cause? What tests can you recommend? Should she see a Neurologist?