Sirenita48,
Welcome to NeuroTalk.
Concussions often include a neck injury. Icing your neck can be helpful.
You can make your own crush-able icebags. Mix 1 cup of rubbing/isopropyl alcohol with 2 cups water. Put it in a freezer zip lock bag and squeeze most of the air out. Freeze it. When frozen, it will crush a mold to any shape.
How to Make Your Own Gel Ice Pack or Moist Heat Pack
Neck inflammation can contribute to dizziness.