Originally Posted by Jo*mar

I had what I called "whooshing" sounds early on, and it was really bad during the severe spasms.

The only doc that told me what it was ,a bruit, was my chiro...

I'm just guessing that you still have some neck muscle tightness and it is pressing a bit on the arteries and causing that lovely annoying sound.
But just my guess...
If you are getting PT or anything ask the person about it maybe they can do some therapy for those specific muscles.

Have to be careful with self care in those places , don't want to press or stretch on the wrong thing....a pro is much safer for these areas.

I will describe how chiro treated my issues during the severe spasms.
may or may not work for everyone though..

A good PT should know how to do this technique also.

He more or less "hooked" or anchored his thumbs in my scalenes and then worked on the SCM after scalenes.
He applied a firm slow steady downward pressure for about 30-40 seconds, and repeated in next section til the full muscle was worked on.

He also did similar with the heel of his hand right below my collarbones and over upper chest.
Was not enough pressure to hurt at all , mainly stretching/releasing the muscle & fascia I believe.