Burning at back of the throat can be acid reflux which particularly flares up when lying down at light time. I've had it really bad before where the pain and feeling kept me awake and made me cry. To avoid that, don't eat right before bed. But it could also be anxiety.
To me, your other two symptoms seem solely like anxiety as well. The feeling in your chest can also be anxiety (acid reflux gives a lot of weird symptoms in the stomach, chest, throat, mouth etc).
Hope you feel better. I'm going through a rough time right now as well so I know how it is to have one symptom after another ugh