I had heart issue – paroxysmal atrial tachycardia , which was solved with cardiac catheter ablation, now not feeling well?

Hi I am 23 year old female , with a recently resolved heart issue of paroxysmal atrial tachycardia , which was solved with cardiac catheter ablation. I thought that would fix me feeling not well and it’s helped but I still frequently feel sick. I suffer from fatigue, frequent urination (up in the night at least twice always) as well I have had two previous incidents of passing out. The one I was sitting and my mother described as me slouching over and my limbs going straight and shaking. I went to the hospital but once I levelled out they discharged me with no real answer. I have always had to eat frequently to not get dizzy but now it’s more extreme. Like every two hrs or so . I have to eat and drink a lot of water. As well I have lately had more instances of throwing up and feeling nauseous for no real reason. I am a very skinny person for the most part. I am 5′ 3″ and 99lbs and this is despite eating a lot. I would really like some ideas on what might make me feel this awful. Thank you