You seem to have a sincere desire to help others. If you are interested in the medical field you have the potential to become a very good nurse. There will be a few years of school and hard work to prepare for this, but it seems that it would be well worth the effort.
As for finding someone new, focus on the type of person who you would want to be with, i.e.; what qualities, personality, likes and dislikes. The more you think about this you will put forth a positive energy. This energy will surround you. This positive, self-assured attitude will help attract a person with the type of personality that you are looking for.