Roberto, the imagery of a big shark underneath the floor you were walking on to your house is quite striking. Sharks often symbolize deep-seated fears or threats lurking beneath the surface. Given your recent experiences with financial stress and relationship difficulties, this shark could represent these underlying anxieties that you might not always be fully aware of, but are still present in your subconscious mind. The house in your dream often signifies your inner self or your sense of security. Walking towards it suggests a journey towards self-discovery or finding a safe haven amidst life's challenges.
The fact that the shark couldn't get to you because you had a protective necklace is quite significant. Necklaces in dreams often symbolize a connection or a bond, and in this context, it serves as a protective talisman. This could indicate that despite the underlying threats or fears you perceive, you have something in your life that gives you strength and protection. This could be a coping mechanism, a supportive relationship, or even your own resilience. The necklace protecting you may also symbolize your personal growth and the tools you've developed to shield yourself from emotional harm.
The specific focus on the shark being underneath the floor suggests that these fears are not immediately visible or on the surface of your consciousness. They are lurking beneath, perhaps in your subconscious mind, but they are not currently in a position to harm you due to the protective measures you've taken.