@benze,
The cord from your testicle could be normal, again physiscal evaluation in mandatory. It may be nothing more than the spermatic cord. We humans are not perfectly symetric we al have one side of the body that is bigger o r smoother. Example: the feet, anyone can relate going to buy shoes and one foot is perfect and the other feels tight on the same sized shoe. Women can relate with the breast, almost everytime the left one is bigger.
The lumps in the jaw. If you feel them over the border of the jaw bone the may be common irregularities of the bone, also facial artery causes a crease on the bone that canbe touched. Ganglia of the maxilar area can suddenly swell even in the abscence of disease. they are all year round active, like soldier camps during a cold war, always ready in case of an infection to appear. But again physical evaluation is needed to confirm and determine procedure.
If the complaint is restrictive breathing there are twooptions, one an integrative type of specialist (internal medicine) or pneumologist. He will decide what procedure to make. I will be likely an spirometry.
The nerve that controls breathing is on the neck, actually C4 level. The nerves of the back only control de muscles around the toracic girdle. They are not directly involved in respiration, altough they an tightne the chest by muscular contraction. In that case the problem is muscular and not pulmonar. But for this outcome .... again physical exploration.
Yes there are a few diseases that can cause a complex combination like the one you sdescribe but is impossible to make such assumptions right now, and they are very rare diseases and you should be experiencing far more complaints. So there is no use in making a list.
There is no option, no help on the internet will be enough. Physical evaluation is of upmost importance. Acoid internet sites, avoid web med. most patients end up very scared, there are tousands of trolls on the web. Do your self a favor be calm and search personal proffesional help.
(if i could have a dollar for every patient that had read he had cancer because a search of symptoms he or she did on the net i will be rich)