your problem can be any number of things. there are literally thousands and millions of mental and physical along with normal diseases/disorders and things that can cause this.....

examples (not a diagnosis of your problems specifically, just a general list of mental physical and normal things that share the same symptoms you are having...)

Sleep deprivation
ADD
ADHD
Schizophrenia
anemia
bipolar disorder
not eating correctly for your body
learning disorders
high concentration
medications
depression
PTSD
seizure diseases/disorders
colds/flus/ /virus/bacterial infections
stress
over stimulation/excitement
anxiety
dissociation
depersonalization/derealization
Dissociative amnesia/dissociative fugue
unspecified Dissociative Disorder (aka DDNOS)
OSDD (other Specified Dissociative Disorder)
eating disorders
dehydration.......

and the list goes on, if you google your symptoms you will get over 2,350,000 results of what this can be (in general)

here on psych central we are not allowed to diagnose a persons problems, all we can do is tell you whether we have had the same problem and what our own treatment providers have called it in ourselves....

I have had these same problems. in........me.......my treatment providers call it many different things depending upon other accompanying symptoms....bipolar disorder, PTSD, multiple Sclerosis, sleep deprivation, psychosis, not eating enough, dehydration, sleep deprivation, stress, anxiety, depression, UDD, mania, over stimulation/high concentration shut down,.....

to find out what this is with in ......you......you will need to contact a treatment provider ie medical doctor, or mental health treatment provider in your off the computer location. they will be able to do some tests and evaluate your personal health issues that is done in your location for diagnosing medical and mental health problems.