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The pins and needles feeling is most likely secondary to a nerve involvement this can be from the costochondritis if it is inflamed and compressing on a vein or it could be due to another cause such as cervical impingement, thyroid disorder, diabetes, electrolyte imbalance, vitamin deficiency, etc. I would recommend that you be seen by a doctor within this next week to make sure that it isn't anything else that would require more medical attention. In the meantime try to rest that arm as much as you can. You can also try to see if stretching your neck and arm helps in relieving any nerve compression that may be the cause.