ExcessTension force on neck. Advise!

I was suffering from c3-c4 disc bulge, I was taking medication and it gives me sufficient pain relief, I consult a physiotherapist and he advised me traction of the neck, so I apply traction force on neck with the help of a person but he applied excess tension force on my neck one to two time, my weight is 80kg, the tension force on my neck is so strong that i get moved from one place to another, the force is applied slowly not abruptly, it results in slight vertigo and nausea but only for first'day, now I am suffering from neck pain and pain at the base of the skull near craniovertebral junction, all the neck movement like flexion , extension, rotation and lateral bending are pain free without any neurological compromise, should I have to done craniovertebral junction mri, I am very afraid of c1-c2 instability or ligament damage, please advise me and also tell me how much tension force craniovertebral junction and cervical spine can withstand safely without any damage, please advise