Thanks for your question and sorry to hear about your injury
. What you are describing sounds quite common. In addition to your baseline "woozy" feeling that you describe when you think about your injury or look at your thumb, you ask some good questions about how to overcome these sensations. I recommend that you speak with your doctor
. First, your problem could be related to a number of things, but is quite common. Most people will have some of these same symptoms in similar circumstances. In the worst cases, the body can have a vasovagal reaction, that can result in fainting and is mediated by a nerve relay process involving the brain and other parts of the immune system and can result in fainting, a process designed to help maximize blood flow to the brain. Most people feel shades of this reaction at some point in their life. As for how to overcome these feelings, the best answer is that repeated exposure to the things that make you squeamish now will gradually decrease their effect over you. Most people have some of those same feelings, but surgeons
have been exposed to large amounts of blood for so long that it no longer bothers them. Appropriate de-sensitization may help. Please speak with your doctor to clarify and assist as needed.