thought i am fine but it come back again

[alba]

i don't know what i am suffering from it's been 4days i am feeling fine, ok, no sleepy, today suddenly i felt so so sleepy, tired again, after i felt so fine and good, i am on leave from Mon, tues and those 2 days i feel good, and wed thurs also i felt good. suddenly tdy it come back, i don't know waht went wrong. i still feel a bit dizzy, but not bad, today i hate it, i am going for holiday 4days oversea,n ow i am feeling so drowsy again. how to handle , help

[alba]

i am wandering could it be the food i ate just now, or last night i did not sleep well, i slept at 1.30am wake up at 7.30am. but afternoon i nap 1/2an hour. isn't it sufficent?