i am guessing it is related to the brachial plexus in your neck and some cervical /dorsal spine subluxation.
I used to have very similar symptoms. A Chiropractor will be able to evaluate if this is teh case
Give us an idea of any previous accidents, injuries, surgery, hobbies, what your job involves etc, bodyweight/height
20 years old ... well, there are many possible causes, some serious but to tell you the truth it would be better to search system by system. Most of what you describe sounds like circulation. A stress test probably would not find it. You might be able to get a hint by monitoring blood pressure (PLUG: medhelp has a blood pressure tracker that assists you in record keeping)
It could also be endocrine, as certain hormones tell the body to speed up or slow down; their levels could be slightly depressed or elevated. It may only happen during certain times so a blood workup might not show that as the blood wouldn't be drawn at the right time of day.
Finally, it may just be something so minor that the tests will never show it (yes, the symptoms you have may not be minor, but the chemical concentrations that would show it could be minor). Biological systems like our bodies are not very exact.
forgot to add in ive been noticing my limbs falling asleep very easily all i have to do is lean on or sit the wrong way for a few mins. and they will go tingly and at times almost always in my hands and forearm ill get this like electric shock feeling that is triggered by press or rubbing a certain place on the arm
im 20 and i have not had my spine checked
have you had your cervical spine checked out by a chiropractor?