I Have Been Choking Quite A Lot Recently Can Happen

I have been choking quite a lot recently can happen when I eat or drink or even just swallow saliva.
These last 2 days I've been struggling to breathe when it's happened and unable to fill my lungs with air almost as if some thing is blocking the airway. It's happening more Often and I'm worried. The left side of my thro a t has been sore for sometime now what should I do?