My shoulder does the same thing man. Let me know if you find an answer. I've never tried single set, but I even when I limit myself to 2 or 3 sets of mild work I still experience the pain.
Stress and extra energy is probably the main reason for your lack of sleep which is not good for your gains at all! You gain the most and recover while you are asleep. You really should look towards natural methods first as it will help you in the short term and long term. Go to this site...
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