I'm not trying to frighten you, but you may want to have a look at Post-Traumatic Stress Disorder. You could have a minor case of it, but the symptoms sound similar.
* Reliving the event Bad memories of the traumatic event can come back at any time. You may feel the same fear and horror you did when the event
took place. You may have nightmares. You may have flashbacks. Sometimes there is a trigger (a sight or sound that causes you to relive the event).
* Avoiding situations that remind you of the event You may try to avoid situations or people that trigger memories of the traumatic event. You may
even avoid talking or thinking about the event.
* Feeling numb You may find it hard to express your feelings. This is another way to avoid memories. You may not have positive or loving feelings
toward other people. You may not be interested in activities you used to enjoy. You may forget about parts of the traumatic event or not be able to
talk about them.
* Feeling keyed up You may be jittery. You may be alert and on the lookout for danger. This is known as hyper arousal. It can cause you to:
suddenly become angry or irritable, have a hard time sleeping, have trouble concentrating, fear for your safety and always feel on guard, or be very
startled when someone surprises you.
If any of the above apply, check this link out.
Just take your time and do a small amount of research. Make sure you get a lot of sleep and you're hydrated. If the problem persists, and you're
worried, just talk to a general practice doctor.