I have had a runny nose and congestion in my throat and nose for about four days now. my throat has started to itch and hurt very badly.what do i have?

Allergies v infectio: This could be from allergies (post nasal drip) or an infection. If allergies, an antihistamine (claritin) and a nasal spray (nasacort (triamcinolone) AQ is OTC now but if pregnant use rhinacort AQ). If infection, will likely need antibiotics if last more than 10 days without improvement

Likely virus: Your symptoms describe an illness that sounds most like a cold or virus. If the soreness in your throat persists check with your doctor about a strep throat. If so you may need an antibiotic. If you have trouble breathing or swallowing be seen sooner at the urgent care or ER.