JJ,

When you ice your neck, you are attempting to reduce inflammation. The upper neck is easy to injure. The C-1 (atlas) to occiput (base of the skull) joint is common for inflammation that can cause head aches, blood flow to the brain problems,

If you have odd sensations, I would not be surprised if you have unresolved injuries.

The protocol for icing is 15 minutes on, 30 minutes off, repeat at least a few cycles, especially in the evening. If you sense any inflammation in the morning, do it then too. You can make crushable ice packs with zip lock baggies and 1 part rubbing alcohol (isopropyl) and 3 parts water. Freeze a few of these so you always have some ready. You can wrap them in a thin towel to reduce the ice cold feel.

It will also help to find ways to sleep with your neck in a straight alignment. It will reduce the night time inflammation so you get better sleep. It may help to take an anti-inflammatory med like aspirin or ibuprofen.

My best to you.