tired and hungry all the time

is it normal to feel ultimate fatigue, whole body feeling extreme discomfort, super increased hunger and mood swings? I've not getting enough sleep bc the discomfort im feeling every now and then. its also has affected my work bc i had an episode of near-syncope last week. throughout my pregnancy, i think abt 5-6x near-syncope episodes in total. im at 26weeks now and it seems the roller-coaster ride is even more worst than before. :'(