Dream Moods has this to say on one’s own death. (assuming, indeed, you were dead, this is what seems to be implicated based on where you were in the dream)
To dream of your own death indicates a transitional phase in your life. You are becoming more enlightened or spiritual. Alternatively, you are trying desperately to escape the demands of your daily life.
This isn’t the dreamer being frozen, but it’s what the site gave me;
To dream that something is frozen represents something that has been suppressed, rejected, or denied. It could represent something this is not fully developed. Alternatively, the dream may refer to your emotions and cold or bitter feelings. To dream that someone is frozen indicates your coldness toward that person or vice versa.
Dream Moods isn’t very clear what to do with the interpretations, besides not to take them too seriously, and that it’s mostly for fun.
Given the descriptions of the subject though, if we decide to get all serious and try to relate them…perhaps there is a change in your life, or a spiritual change that you dislike, dismiss and distrust. Perhaps it’s brought on by past memories and experiences. The sawing off of your members may signify your desire to escape this change, however, since it is in you, and is most likely quite important, the discomfort felt at having your lower section sawed off is a reminder that whatever this change is, it can’t be dealt by merely running away or denying it.
Alternatively, perhaps you’re sick of routine and daily life, and resent the idea that you cannot truly get away from it. Perhaps, you yourself being frozen indicates something about yourself that you truly despise and wish would go away, however, as noted by the discomfort of the waist sawing, this may never be entirely possible as it’s you.