Cut my gum. I lost a lot of blood and have a loose tooth. What can I do?

Possible Gum Disease. If you had quite a bit of bleeding, this would suggest that the tissues are probably not healthy. Loose teeth can also be from gum disease as well as from trauma and infections among other problems. An evaluation from a dental professional is definitely needed to diagnose.
See dentist. Trauma resulting in loose teeth is probably an alveolar bone fracture. The bleeding could be from a laceration. Both can be handled easily by your dentist. Also your nerves in your teeth need to be checked. The dentist will probably stabilize and reposition the teeth. Good luck, you'll be fine. W this good care.
Dentist immediately. See a dentist immediately. The tooth may need to be splinted to the other teeth and the cut may need to be stitched.