How can I tell my mom I need help?

I am currently 15 although when I was around 10 years old I started having seizures and was diagnosed with unknown epilepsy shortly after.  In January I was released of my medication(TrolendiXR). The doctor told me to look out for certain things such as twitching, muscle jerks,  and similar things that I can't control. I have lately realized that I sometimes have muscle spasms, and migraines. I don't usually have mmigraine. I all I can do is worry. I don't want to go back on medication as only TrolendiXR have worked for me but it made me very depressed, memory loss, and made me work very slowly. I don't know how to tell my mom. How can I tell her that I am worried about myself and need help?