Oh no! Not you too with the possible HA symptoms. Please feel better soon, but like we've been on to Sally, if you even remotely think that it might be a heart thing, please go and have it checked out.

It does sound like you may have pulled a muscle.

Just a thought: There is a muscle (Scalene) in the front of the neck that refers pain to the upper shoulder, under the shoulder blade and into the chest if it goes into spasm or gets a trigger point in it.
You might try pressing on it (it is in the area just in front of the most prominent muscular cord in the neck) to see if it makes the pain worse. If it does, then holding the pressure for a minute or so will sometimes relieve the referred pain.

Hope that you find relief for what ever is causing it quickly and that you get your sleeping cycle back in balance.

With love, Erika