I am trying to find out how life could change for the middle-class today if we had a high-impact financial crisis. Please help-me / let me know if this question could be rephrased better.
I would recommend reading the novel "City Boy," by Herman Wouk. It was set in 1928, just before the 1929 crisis, and gave a description of middle class life going into (but not after) the 1929 crisis.
For an account of life during the 1930s itself, the "classic" is John Steinbeck's "Grapes of Wrath," about how formerly middle class people fell into poverty.