Max,
i just lost a long reply & just haven't the time or computer illiterate energy to do it all again so please accept a shortened version.
Testicles - get to the dr now!!!! Demand tests (drs are just mechanics for your body which you own).
Chest - how long has this pain been there? If more than say 2 months get back to the dr also were ultrasounds/scans done or just x-rays?
Malaise - may be just because of the above two or may be that there's negative stuff going on?? But could also be your age?? Hormones in teen years??
I suggest you take life abit easy so as not to cause further damage to your chest or testicles!!!!!! But you might feel better if you did some of the following things: a walk somewhere peaceful/pleasant, give yourself a present each day, this can be a chocolate, a drink, watching a movie, whatever but you actually think "this is my present to me for today", smile, that may sound silly but it works you really do feel better when you smile, so smile (not like an fool!!) smile & say hi to people, smile whenyou see something pretty/nice/pleasnat/happy & smile at yourself in the mirror all the time. Just try it & see.
If the smiling etc doesn't work & you get checked out thoroughly re the other issues & all is ok or they heal then I suggest you get a full medical blood & urine tests, kidney & liver function tests, sugar levels etc to see if there's anything out of balance that is actually causing the malaise.
Good luck.