Help with rotator cuff/shoulder pain please

[Cronos]

Hey, can someone with experience in this department please help me out. For the past several years of lifting (longer than I can even recall), I have had a off and on recurring shoulder pain in the left shoulder. It is usually brought on by some form of pressing, usually overhead. I had someone tell me it's probably a rotator cuff, but I will describe the symptomsI for you.
1.Pain at the back/side of the shoulder when I perform a overhead pressing motion (even without weight, and ESPECIALLY with weight) This doesn't matter if I use free weights, the smith, or any other machine.
2. Pain at the back/side of the shoulder when I rotate my arms behind my back, say while holding a broom stick in both hands.
3. The pain is most felt at the bottom to midpoint of a press, and not much at the top.
4. No pain during dips or declines, but a little during flat bench, worse still for inclines, and absolutely the worst during overhead presses.
5. The pain feels like it's "inside" the shoulder for the most part, except there is one spot on the out side. You know that bone on the top of your shoulders right between your traps and your delts, on the very top? Well if I apply pressure to that with say my hand, it hurts quite a bit. There is no other tender spot in the outside like this.

Any feedback from you guys would be greatly appreciated, as it is playing havoc with my routine and driving me nuts

[dec11]

you'll never know without a MRI scan, ive also a suspect rotator cuff injury and was referred for scans. the type of pain is very varied from what ive read and been told by other sufferers, get off to the doc mate

[cro]

bruary is also going through this..