Something wrong in my neck don't know what.?

I had something a few weeks ago that sounds very similar to what you're describing. At first I thought it was a swollen thyroid gland or something, but when I went to my doctor he said it was a cyst that should disappear on its own after a few days. And it did! If I was you I would leave it like a day or two and if it gets worse then seek some more medical advice.