When exercise sometimes get chest pain goes after sitting down, had echo, ecg, treadmill stress ecg, 24h holter. All normal - age 22, male?

Typical or atypical. Not all chest pain is cardiac in origin but you should discuss this with your doctor -- there are other tests more definitive to rule out coronary artery disease.
Coronary spasms? It could be caused by coronary artery spasms... All the tests you have had are not so accurate for coronary artery disease. You can benefit, however, from a session of multifunction cardiogram... Good luck! http://en.M.Wikipedia.Org/wiki/multifunction_cardiogram.