How do I get rid of this sick feeling?

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i guys, Well I am trying so hard to gain weight and add more calories a day, but am struggling at the moment, I have 2 good days then back to square one because of how my body feels, I feel nauseous a lot of the time which then makes it hard to eat, but its not because I am sittin here eatin pies and cakes all day long, coz I am not, I eat normal food, just adding an extra slice of bread and bigger portion of dinner, my bowels wont stop growling, and my intestines make the most wierd sounds, my partner says its just my body digesting the food, but it feels like I need to 'go to the loo' all the time but I dont, is anyone else havin these symptoms? And how do I fight with my head sayin 'see I told you food does make you feel sick' I dont wanna keep givin up because I keep feelin crap every 2 or 3 days, its like 1 step forward and then 2 huge steps back. Please any advise? Thanks