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Truly speaking there is no condition or pathology in literature which will explain your situation.
Did you notice this after some heavy lifting or straining ?
Did you notice any swelling or bulge in the groin - Evidence of hernia?
Do you have any problems while passing urine?
The most common explanation which could be given here is infection of the testicle or the epididymis. Infection and inflammation of the testicle or the epididymis can cause tissue edema in the nerves traveling along the spermatic cord and numb the cremaster. This could drop the testicle a bit.
Other causes are hydrocele, torsion testis, hernia which are readily diagnosed on an ultrasound.If two different ultrasounds didn't pick it , it is not there.
If it is infection/inflammation it should respond to the antibiotic and anti -inflammatory drugs. If you are not taking any anti -inflammatory drugs you can add one to the cipro - Motrin or Aleve.
Anatomically the left testis is always lower than the left one.One more condition which can cause pain is varicocele - dilated testicular veins. This could explain the pain sometimes. But this is also easily diagnosed on a Doppler scan of the spermatic cord.
If you have any questions, please let me know.
Sorry you felt like that. But there is little explanation only. I would opt out of the question so that another expert can have a look at the problem. Take care.