Got your Xanax all fired up? This week is bank-earnings week. And, as such, we feel it only fair to duly warn you that the carnage you are about to see may not be suitable for all viewers. You can’t say we didn’t try. So, without further adieu, an in-depth look at what’s expected and what’s to come. And yes, it’s all bahhhhd.

Only a year ago, Wall Street reveled in an era of superlatives: record deals, record profit, record pay. But a mere 12 months later, nearly half of the profits that major banks reaped during that age of riches have vanished.

The numbers are staggering. Between early 2004 and mid-2007, a period of unprecedented wealth on Wall Street, seven of the nation’s largest financial companies earned a combined $254 billion in profits.

But since last July, those same banks — Bank of America, Citigroup, JPMorgan Chase, Lehman Brothers, Merrill Lynch, Goldman Sachs and Morgan Stanley — have written down the value of the assets they hold by $107.2 billion, gutting their earnings and share prices. Worldwide, the reckoning totals $380 billion, much of which reflects a plunge in the value of tricky mortgage investments.

More downbeat news is expected this week, when several big banks, including the ailing Lehman Brothers, are scheduled to report results for the latest quarter. As the tally of losses keeps growing, many bank executives — and their shareholders — keep asking the same question: When will the pain end?

But the finish line just seems to keep moving further away. Even when the losses end, bank executives are looking toward a new era of lower returns, thinner profits and fewer jobs. Greater scrutiny from regulators is forcing Wall Street firms to reduce their use of leverage, or borrowed money, which had fueled profits in good times but backfired when the credit crisis struck last summer. Nearly every finance company is cutting jobs and battening down.

“They are going to have to build a new business model,” Richard X. Bove, a financial services analyst at Punk Ziegel, said of investment banks. “I do not believe those businesses have the ability to generate the kind of profit they did in recent years without all the leverage.”

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