Right side chest pain?

I'm on vacation, and I've been doing a lot of walking and wearing a backpack daily and whatnot, but I just noticed some bad chest pain on the right side of my chest, it hurts to press and when im not touching it, it just aches. I would like to think it'd just from wearing a heavy backpack because i've been wearing it for 3 days straight, but i'm on Vacation so I don't have a doctor or know where a clinic is or anything around here, I do have a history of bronchitis lately, and I did have quite a sore throat the other day with a bit of a cough. any information would be great, thanks.