The only solution to torsion is immediate surgery. So seek help right away. Go to a GP or to the local hospital.
Sometimes GP’s wrongly diagnose it as an infection, ascribing antibiotics. Because the real problem is not recognised, it can cost you your testicle. If you think it might be torsion discuss this possibility with the doctor.
In the hospital the testicle is brought back to normal. In order to prevent it happening again the testicle is sawn to the inner side of the scrotum. Normally they fix the opposite testicle at the same time.