What are some possible causes of burning in my mouth, throat and chest? it feels like i gulped down a hot drink and has been going on for two days

Possible GERD: Get examined and evaluated for GERD or gastritis with reflux. I suggest starting on PPI therapy such as OTC Nexium or Prilosec as well as antacids like Mylanta or Maalox.

Burning : There are multiple possibilities, including acid reflux. You need a clinical examination to make an accurate diagnosis. See your medical doctor or an ENT specialist.

Hard to say: May be acid reflux, side effect of a medication, yeast infection of mouth and throat, etc.. best to have it checked by a doctor.