Aiyooo 4kg gain in between checkups memang boleh jadi stress, but honestly half-day fasting + bad gastrik tu dah cukup reason lah, your body is stressed and holding onto things! My mum friends yang pernah gastrik parah, lapar-lapar sikit but makan frequent small meals, and the bloating + water retention turun after things settle down, so maybe focus on healing the gastrik first? Once your stomach is happy, the weight usually comes off easier (our bodies are smart like that). Definitely worth asking your doctor or a nutritionist about it, especially since gastrik is involved, tapi in the meantime be gentle with yourself la, puasa half-day + not feeling well is already a lot on your body!