Worried about taking my first Kesimpita shot during a bad flare up

So I (30 year old male) was diagnosed with MS about 3 months ago after half of my body went about 60% numb , I still could feel things and walk but I had numbness. Went to the ER got some MRIs done and I have multiple active lesions in my brain and spine. Fast forward to now , my numbness went away on its own and I finally received my Kesimpta! I was planning on taking my first dose tonight or tomorrow , thing is as of 2-3 days ago I’ve begun a huge flare up (the worst thus far) causing zaps and shocks all across my body and leaving me unable to sit and I have to stay laying down or go walking for a bit. I’m scared to take my first loading dose considering the doctor told me to expect to feel fluish with the first shot and I am already in a bad flare up/ relapse. Anyone here with experience starting a DMT during a flare up? Thank you so much