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Was the injection an antibiotic?
My cat had similar tummy problems, of unknown cause - maybe a different food fed while I was away. Bright red blood is fresh blood, from the lower bowel. A probiotic for cats and slippery elm (as Mama B suggested) helped her. It took a little while. Bland food too. No harm in continuing a probiotic and slippery elm. Hope she feels better soon. Such a worry.