The vasovagal type of trypanophobia is usually inherited, it's genetic based. Who else in your family has this? Have you talked to them about how they cope?

You probably should get treatment as if you have vasovagal, the low blood pressure can actually kill you.

"The best treatment strategy for this type of trypanophobia has historically been desensitization or the progressive exposure of the patient to gradually more frightening stimuli, allowing them to become desensitized to the stimulus that triggers the phobic response. In recent years, a technique known as "applied tension" has become increasingly accepted as an often effective means for maintaining blood pressure to avoid the unpleasant, and sometimes dangerous, aspects of the vasovagal reaction."