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thanks for query, can you explain what you mean by numbness?
Were you told cauda equina?
Then you must have had decompression surgery?
With the nausea, I'm not sure thats related to the leg numbness
You'll need tests for that such as abdo scans, blood and stool tests
The stool test would be to exclude Helicobacter pylori that can cause nausea
The tummy scan would be for gallstones that can cause nausea
The blood tests is to exclude other causes of nausea