Shoulder pain for 6 months - no diagnosis

My left shoulder has been in pain for 6 months now. The pain has progressively gotten worse and worse and it is now at the point that even moving my arm slightly is troubling. I had an ultrasound done recently which showed nothing. Everything the ultrasound could see was normal.

The pain has always been at the inside front of my shoulder, but recently it's been spreading to my bicep, outer upper chest and neck. The front of my shoulder is still in pain the most frequently - to be precise, it's the area just below my collar bone and just inside the shoulder ball. That seems to be the source.

I'll go through all the symptoms I have.

- doing these things causes extreme pain at the inside front of my shoulder: lifting my arm to the front, above my head, or to the side, picking up even slightly heavy objects, pushing or pulling heavy things.

- doing simple things such as brushing my teeth, dressing, doing my hair are painful, again at the front of my shoulder.

- lying down on my back with my arm by my side gives me a distinct burning pain in my shoulder, and at times it radiates down to my bicep. This burning pain only comes when i lie down. (Just started a few weeks ago)

- my outer upper chest, near my armpit, hurts at times when I'm resting.

- recently I've started to sometimes feel dull pain in my neck, just above my collar bone. Not frequent at all.

- if I apply heat to the shoulder I sometimes get pins and needles down my arm, and it goes numb in certain positions (lying down and sitting down). This doesn't seem to happen as much with ice treatment. (New symptom again)

- laughing causes pain, as does talking too much and too loudly. After any sort of a gathering I'm always in immense pain, even if my arm is fully rested.

- I have trouble feeding myself most of the time.

It will probably be helpful if I tell you the cause of this pain. I injured my other (right) shoulder a year ago in March. I was unable to sleep on that side, or on my front, since that injury. I couldn't fall asleep on my back and so I slept on my left shoulder, exclusively. All night, every night. After about 5 months I started feeling discomfort when lying down on it, but I made nothing of it and carried on as that was the only way I could sleep. The discomfort slowly turned into pain (at the inside front of my shoulder, below my collar bone). I would only feel this pain when lying down on it. Apart from that my shoulder was absolutely fine.

Then one morning I woke up and the pain was immense and using my arm was painful that whole day. (The pain being exclusively in the location described before - nowhere else.) Since that day I have learnt to sleep on my back.

The pain did go away after a few days of rest but since my right arm was pretty much unusable, I had no choice but to resume using my left.

So the pain would come and go depending on how much I would be using my shoulder. Driving was the worst at bringing the pain back. This on and off thing went on till about 2 months ago. Now the pain is always present.

It's difficult to use both my arms and I'm pretty much stuck at home, being looked after by my family. Even doing the simplest things has become impossible.

I'm waiting for surgery on my right shoulder for a suspected labral tear but I still don't know have a diagnosis for my left shoulder.

Any help would be appreciated. What could the problem be? What step should I take next?

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