Thanks for your query.Based on the facts it appears that you may have Varicocele on left side This can be confirmed only on clinical examination and Doppler study.Please consult some surgeon for clinical evaluation..Pain is most likely to be due to dragging of testicular vein which drains...
Thanks for query,
It seems that you might have kidney stone on left side.
There is also possibility of infection in your genital tract.
go for ultra sound and find out the cause.
Go for urine check up for blood and pus cells.
ok and bye.