I Am 22yrs Old, My Height Is 5ft 5in And

I am 22yrs old, my height is 5ft 5in and weight is 65kgs. Since yesterday, I am having serious acid refluxes. Today, when I woke up I started feeling severe joint pains and weakness in entire body. Though, I feel hungry I am eating less as it feels like I will vomit if I eat anything. After online research I thought that this is GERD, but, I have'nt started any medications as of yet. I am trying to change my diet. Like, I am eating bananas every 4-5hrs etc.