What Causes Dizziness And Vomiting After Suffering From Back Injury?

i m studying in Amsterdam. and i m a stranger here. my friend injured her back and she really felt painful and we went to hospital and she took x-ray and ultrasonic wave. and they said couldn t find anything and they gave her prescription which are. paracetamol 1000mg(2 tall) 3x1 day. diclofenac 50mg(1tall) 3X1 day. oxycodone MGA(1tall) 2X1 day 10mg. ---------------------------------------------------- oxycodone 5gmg 5g (1 tall) 5x day. and i found this from internet and this is all painkiller and there have any fundamental medicine. also they didn t offered any physical therapy. we went to see doctor 5times but they told us same words..... and she vomit, dizzy and seems really serious.. here people use dutch and services are not good enough.. can u tell what should we do? we have a insureance plz help me.