Hello. I am a 18 year old female who is relatively a healthy weight and has no history of heart problems. Recently, the same thing has been happening to me. When I sit down at my computer(and this only happens while I'm sitting at the computer) from between 3:30PM and 5:20PM I had uncomfortable, sharp pains in my neck/upper chest and my sides. I check my pulse everytime and it seems relatively normal. I feel no tingle in my arms and I do not feel faint. However, if I drink a little bit of water, it seems to get a little better. These spells only seem to happen for about 5-15 minutes as well, only once or twice a day.