light headed and sick?

i’m sick, idk if it’s a fever or just a really severe cold, but my stomach is messed up (i barely eat), I have a cough, and I keep getting cold and then really warm. I can’t tell if i’m freaking myself out but I feel lightheaded when I walk sometimes. I have class at 3:00 and I can’t decide if I should go or not or just rest. I am so tired of feeling sick :( anyone help?