Welcome to HCM. Mantoux test
uses PPD in a low dose just to check if previous infection with TB has occurred or not. I do not think your dizziness
spell is due to that test. Flu
like illness definitely can cause dizziness and headcahe. Mantoux test is read positive based on the size of the wheal (more than 10mm) produced by the subcutaneous injection after 48 hours. Thanks.