Nervousness

Since last night , somehow I have been feeling nervous. I could hear my own heartbeat last night. Had tough time sleeping.

What could be wrong?
Whenever I feel little restless, I fear about all my dear ones. I don't know why I feel so?
This morning, I was very nervous and I was so very restless. I don't think I ever felt this way.

Nervousness does happen to me sometimes if I have an exam or an interview. But it is weekend now and I am not really preparing for anything now?Whats wrong?

Is it just the weather that is making me feel this way or do I need to get my hormones checked?
As long as it is either or both of the above, it is still okay !!
Hope everybody is doing good !