@miapi , you’re right to seek a second opinion on the advice given to you.
Yes, you needed to change up from the Copaxone, as it wasn’t working for you. But, why settle for better (Tecfidera), rather than best. You need to research the options available so that you can play an active part in future related discussions. The following is a good place to start :-
(This utility is UK-centric, but this isn’t important to use the tool).
All Disease Modifying Therapies (DMTs) are powerful drugs and come with known risks. The risk is mitigated by regular monitoring. If the risk increases beyond acceptable thresholds, then your DMT will be reviewed.