How can I do with the emotions after a finger amputation?

Talk it out. It is very important to be able to get emotional support after an amputation. This can be done in a variety of ways. Some people prefer to get their support from family, clergy or friends. Other people need professional help and will see a social worker or a psychologist. The main point is to see someone and not to suffer in silence.
Support group. Consult with you physician and join a support group.