Dreams involving animals, especially cats, can often symbolize various aspects of your emotions and relationships. Here’s a breakdown of the elements in your dream:

1. Cats: Cats are typically associated with independence, mystery, and intuition. They can also represent aspects of femininity or a connection to personal comfort and home.
2. Hiding in the Wall: The cats hiding might suggest that there are parts of your life or emotions that you are not fully acknowledging or are keeping hidden. It could relate to feelings of overwhelm or responsibilities that you're trying to avoid.
3. Hundreds of Kittens: The large number of kittens could signify feelings of being overwhelmed by a situation or by responsibilities in your waking life. Kittens often symbolize new beginnings, but in this case, they might represent things that are multiplying or becoming unmanageable.
4. Clawing and Pain: The sensation of pain from the claw stuck in your heel upon waking can indicate feelings of being held back or hindered in some way. It could reflect a fear of being hurt by something you are trying to manage or remove from your life.
5. Need to Get Rid of Them: This might indicate a desire to simplify your life or to address issues that have become too overwhelming. It suggests a need for decluttering, both emotionally and physically.

Overall, this dream may be reflecting your current emotional state regarding responsibilities or relationships that feel overwhelming. It might be helpful to take some time to identify areas in your life where you might feel burdened and consider ways to address or alleviate those feelings. Seeking balance and finding ways to manage your responsibilities could be beneficial.