Starting Kesimpta - worried.

I am due to start Kesimpta shortly and have been so worried about the loading doses. I am reading some really horrible things. My neurologist and nurse have said that I will probably have a headache and shakey legs, but what I am reading sounds so much worse and it’s making me not want to start. Is it really awful? I know it’s different for everyone but is it as bad as what I am reading?