Suggest Remedy For Pain In The Chest And Back After Having Lunch

I m a 55 year old, female. Just today, at lunch, I started experiencing pain in the front (at my breast bone) and middle of my back when I swallow. It s like I can track the food/drink down to that point and then there is a sharp but brief pain. It reminds me of a time when I swallowed a lot of it vitamins at one time and they all got stuck in my throat and it would hurt to swallow until they moved down. I did do push ups and lift some weights yesterday but I m not sore anywhere else. I also just started a new desk job, working on a computer, 8 hours a day. It s some better now but not sure if it s that or I have just gotten used to it. Any ideas?