@sbgill91 , Tysabri, along with all Disease Modifying Therapies (DMTs), are prescribed to reduce the frequency and severity of future relapses. It probably won’t affect existing damage and symptoms.
Any new symptoms should be reported to your MS Nurse, to see whether your DMT should be reviewed.
I have no recommendations on CBD vapes. However, the percentage of CBD is important as there are some quite weak offerings out there. CBD Brothers gets a few mentions as a good supplier.