I'm not sure what you mean by "bloody gas" but if free blood is being expelled from your rectum during a "solid + gas" #2 then this needs to be checked out since rectal bleeding is never normal. The causes can vary from minor to more sinister - with the more sinister reasons (such as cancer) tending to occur only at/after age ~40.
Unless your doctor can 100% assure you that the cause is minor (such as anal fissure or haemorrhoids) I suggest that you insist on a colonoscopy which hopefully will provide you with the maximum reassurance - or at worst - a conclusive diagnosis of the cause of the problem.
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