Hello Dr. I Took Almost An Entire Bottle Of Robitussin

hello dr. i took almost an entire bottle of robitussin dm Nighttime. Not at once, but periodically today, Only because this cough ive had for 2months is getting wprse. i have asthma. in the last 30 min, i feel very dizzy, weak, room spinning feeling, and trouble getting words out, along with dry mouth, few other symptoms. im not sure if they are imprtant or not