Don't worry nothing will happen with you by just need prick for blood report... but if you not go for lab test then how doctor will diagnosis the problem? So be brave and go for lab test.... It's take just 4 to 5 second only...
Next Steps
and if you feel so much anxious then ther are medicine available for reduce anxiety.... but it's not advisable in this situation for you so simple go for lab test and ... share with doctor
and Consult a doctor offline or online on practo or chat with me hear in practo.