Dreams involving dark figures can often represent feelings of fear, anxiety, or unresolved emotions. In your case, the presence of a figure that resembles a human shape, especially alongside the energy of your twin sister, suggests that this dream may be a manifestation of your grief and longing for her. The knife could symbolize feelings of vulnerability or pain, particularly since it targeted your joints, which are crucial for movement and flexibility. This could indicate feelings of being stuck or unable to move forward in your life after her passing.

The experience of sleep paralysis adds another layer to this dream. It can be a very frightening experience and is often associated with feelings of helplessness. This may reflect your emotional state regarding the loss of your sister—feeling trapped in your grief or unable to escape the pain it brings.

The panic attack upon waking suggests that the emotions tied to this dream are still very potent and may need to be addressed. It might be beneficial to explore these feelings of loss more deeply, perhaps through talking with someone who can help, such as a counselor or a trusted friend. Journaling about your feelings or creating a memorial for your sister can also be healing.

Ultimately, this dream highlights the need to process your grief, and it’s important to allow yourself the space and support to do so.