I am 22 year old student. Height 176 cm and weight 94 kg.

Around 3 weeks ago, I started to have numbness in my left arm, in the area between the elbow and the shoulder. The feeling occurs ONLY when I am sitting at the bus to uni - around 5 minutes of staying still, I start feeling the numbness. The problem disappears when I change my posture or move my arm. However, 5 minutes later the discomfort starts again. The problem happens only when I am at the bus and reading a book there, doesn't occur when I am sitting at a table and having dinner or laying on my bed.

In addition, around 2 months ago I noticed that when I move my neck ONLY to the left, I felt some weird discomfort in my chest area. However, this problem recently disappeared. Just mentioning this, don't know if it is related to my main problem.

If this will make a difference, 3 years ago I was diagnosed with mitral valve prolapse, but the doctor said that this isn't lethal and shouldn't worry about it.

Yesterday I started digging information in the internet regarding the numbness and nearly fainted when I read that I might have degenerative disc decease or a pinched nerve. I am 22, young and healthy and the thought that I might have something as serious as this scared me out. I really don't want to visit the doctor (as I always visit them about something but they tell me I am fine) and really hope that the problem will soon disappear by itself. What do you think? I soon have important exams at university and don't want this problem to stress me out before taking these exams... I decided to stop checking websites, because they make me feel even more stressed about this issue. I hope that you can give me an advice. Thank you and appreciated.