I would contact the Multiple Sclerosis Research and Patient Welfare Trust, located in Karachi. They may have information that would be helpful to you. http://pakmstrust.com/pages/Contactus.html
Or you could try the Society for Multiple Sclerosis Patients in Pakistan. http://www.smspp.org.pk/contact-us/ These types of organisations are usually familiar with local assistance programmes, grants, or other avenues available to help you find treatment.
I hope this helps!