Can I pray to Michael for protection if I don’t sense anything?

You can keep it simple: say a prayer in your own words, or use a devotional text or symbol that feels meaningful to you. I wouldn’t treat seeing or hearing something as a requirement, or as proof that anything happened. If the practice helps you feel steadier, that can be enough.

I’d separate spiritual protection from a possible physical health problem. If “parasites” means symptoms or a suspected infestation, talk with a healthcare professional rather than trying to diagnose or treat it through a ritual. You can still pray for comfort while getting practical concerns checked.