Fever after eating chocolates.

My 19 months old daughter is having fever after eating a lot of chocolates (silk) at my neighbor's home at a 18 years old's birthday celebration who also got fever today. Should I go to a doctor (serious) or try something else (not serious) and wait to decide about going to a doctor. I didn't give her any medicine except some teaspoons of ajwain leaves juice thrice after which she starts sleeping with a mother feed. She is not eating property too, demanding for mother feeding continuously while on bed, she was active during day time but not throughout the day. Also looked like she had headache early in the morning today as tears rolled down her eyes without crying. Should I take her to the hospital right away or it's normal for a first time eating chocolates?