Hi. Thanks for your query. Noted your history of lifting heavy weight inadvertently, then noted the left testis handing lower than the other and there is pain when you sit or drive bike and the pain goes away if your are sleeping. This indicates that the causes may be either sudden enlargement of varicocele or a recently developed hernia. I would advise you the following: Consult a General Surgeon or Urologist for clinical evaluation. Ultrasonography of the abdomen and the scrotum with color doppler mode also. Tests of blood and urine. This will give you the proper diagnosis and a proper line of treatment.