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Everybody who has put money in the stock market in the last few years is in your boat. There is normally nothing risky about your investment strategy: my husband and my investments are down at least 50%, as are my elderly aunt and uncle, a much more serious situation, as they are retired.
To put your situation in perspective, I have just finished reading the biography of the Duchess of Dorchester (recently made into a movie with Keira Knightly) She constantly had to go to her husband - and others - to get herself out of debt, and this was due to compulsive gambling!- not a sensible investment, such as yours, that went awry. Once she 'fessed up, she felt better, although her husband, quite rightly, was furious.
Cary's advice is spot-on: use the financial adviser as the forum for clearing the air; you will feel great relief, and your husband will probably react with more sympathy than you expect. Good luck!