I have had this problem for many years now, that I feel dizzy, uncomfortable, nauseous, bowel pressure, whenever I have some painful procedures being done on my body. Years back once I was hit by a ball hard in finger while playing cricket and it turned into such an event. Later as I grew up, once I went for a root canal treatment and while in the procedure I could feel the pain of the procedure constantly and started feeling the same. Recently, I went for a blood test. The person pushed the needle once or twice and could get a little blood but could not get more, and when I pulled the needle out I started feeling the same. However, what I have seen is that, if I lie down straight after this uncomfortable feeling it slowly normalizes on its own. Kindly suggest, if it's a serious condition, which specialist doctor should I check with and if there is any preventive course.