Hi Ousaima,

regarding viruses such as SARS-CoV2 ("Corona") I shared my view in my answer to Lucia [https://www.meta-health.net/tiki-view_forum_thread.php?threadId=700|here].
Let's first stick to the individual symptoms which can be very different for people, and find their conflict themes! 

So for your daughter, it had to do with brain stem/digestion of the "information overwhelm" of not having been to school for 2 weeks. But the main conflict is actually self-created in her head, by imagining what might happen. So she triggers herself by these thoughts!

The place at the bottom/back of her head seems to refer to the region of cerebellum? You mention "she said I feel I’ll be attacked by the teachers and I feel I need protection" so this thought creates her headache and dizziness. The back of the head is also where neck muscles can produce "tension headache" by tightening for to protect her neck and head. 
And the underlying theme is of course a lack of self-confidence regarding her intellectual performance. I don't think that this is resolved yet.

The best way to resolve this I think is your love and support no matter what her performance at school, and her own experience that she can deal with the situation better than she had expected. She might then still get a bout of headache (because of resolution and more blood to the brain) but it won't last and won't return if she finds and anchors her confidence. There are some nice bodymind-exercises to help with that, like [https://www.bgcmd.org/wp-content/uploads/2020/03/Grounding-Exercise.pdf|this] and [https://scottjeffrey.com/how-to-ground-yourself/|these]