Hi thanks for your question.
You had a fall in the wash room yesterday and injured your back.
Your improving from back injury
but having nausea
and strange feeling since yesterday.
Please don't take it lightly ,go to E R and get youself evualvated for Head injury
Head injury is coomon cause of nausea after a trauma.
You may need CTscan head to rule out any bleed inside your brain.
Hope this answers yours question.