How To Treat Pain And Soreness In Left Side Of The Body?

Hi, I am a 21 year old male and this is the second time in the last 6 months probably that this has happened to me. Just the left side of my body is sore and aches real bad. And I notice different muscles/parts on my body thoughout the day that become sore. Right now my foot/ankle, ribs, shoulder, if there's like a throat muscle, or my neck, like the front part of my neck where my throat is, and my jaw. All of these are just the left side that hurt and just happened today, and I haven't done anything that would make those parts hurt. Last time it was the similar parts, except I remember my left testicle was also real sore. It's really weird how it is just my left side of these parts that hurt. I can flex my right side and no problem, but the left side of all these ache real bad. Please, if you have any ideas. Thanks a lot.