Feeling uneasiness all day. It could be?

Hi doctor.my name is Asim. i am male. my age is 22. i have recently joined a company about 2 months before. i work in a night shift there. Everything was fine but after worked a 1 week there i felt very strange feeling. when i enterted in the office my body has started sweating and i was feeling very uncomfortable. I was feeling like that i cant stay here anymore but when i went outside to my office things got normal. Then after 1 week same thing happend when i was in my office. i was feeling uneasiness and my body was sweating. this went for few minutes then it stopped. Since that day i dont feel good. I feel very uncomfortable. I think about that too much. sometimes i have waken up suddenly with sweating on my face then i was unable to get  back to sleep again. i am so scared now. I constantly think about  it why i feel like this. when i go outside alone i feel so tensed. i afraid to sleep now. Now i am not getting what problem it could be?