I have been doing every other day fasting for around 10 days. I’ve lost around 3-5 pounds already. I am running 5 miles on my fast days and it has been going well. Yesterday morning, i woke up with a burning sensation in my upper chest which hurts when i get up suddenly, lie down flat, or breath deeply. It has not gone away and I am no longer able to go for runs every other day. Does anyone have any ideas? Thanks!