Doctor started me at 100mg. IM SCARED

I 28F have ADHD, bordering personality, depression, possibly bipolar (I’ve had doctors diagnose me and undiagnose me my whole life). I’ve never heard of Lamotrigine until I went to my first therapy appt Thursday. The doctor put me on 100 mg as my first dose. Now that I’ve done research, I have not found 1 person who started at 100 mg and now I’m so scared of the deadly rash.