Can severe depression cause chest tightness breathlessness and lightheadedness?

DEPRESSION: Yes, but 1st have a physical exam by a Dr. to rule out physical illness. The most complete evaluation for medication is with a Psychiatrist. Consult with a Clinical Psychologist for psychotherapy to help you with ZOOM to find better coping mechanisms for dealing with depression. There is extra anxiety due to covid 19- stay safe, cautious & hold on to hopefulness to elevate your immune system.

Yes, it could: You may well be correct, but as mentioned, get a general exam to exclude pulmonary causes, anemia, thyroid, and diabetic causes. As noted, excellent therapies are available to manage depression. However, in age of COVID-19 need to be thorough.