I think you can help yourself to answer that question by deciding not only what it is about nursing that appeals to you, but also if the cost (emotional, time, and financial if counselling is involved) of working through the blood phobia is worth working in a professional with a relatively high potential for exposure to blood. If you have not already done so, you could help the decision making process by researching and interviewing nurses in different specialty areas and professionals in healthcare or other jobs that require compassion and caring but have less potential for exposure to blood. Good luck in your decision making process.