Since your gums were aching so there are chances of gingivitis and due to this only your mouth is bleeding.
I suggest you to visit your dentist (periodontist) for professional cleaning and after that get your teeth checked every 6 months. Maintain a good oral hygiene by properly brushing twice daily, flossing at least before going to bed and daily rinsing your mouth with mouthwash. Make sure that you don't eat or drink for half an hour after mouthwashing. Try consuming less of acidic juices as they accelerate the demineralization of teeth.
For more info on diseases related to gums and how to get rid of that read an article on the given link...http://www.identalhub.com/articlecategory-gum-diseases-9.aspx
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