I Accidentally Breathed Some Dust Produced By Spreading Lawn Weed

i accidentally breathed some dust produced by spreading lawn weed and feed esters on Wed of last week. On Saturday morning, I had a bitter taste in my mouth and sore throat. The only other symptom I can remember associated with this incident was a slight cough on Thursday after the inhalation. The inhalation was only slight, maybe for 5-10 seconds, and the dust was nearly invisible. That is the only contact I had with the product. I have been using salt water gargles, Ibuprophen for headaches, and getting more rest. The poison control center said I was not poisoned. How long will these symptoms last?