Tips on losing weight in a healthy way?

[Blleghh]

So I've been actively trying to lose weight this year, and I'm down about 10 pounds in maybe 1-2 weeks while fortunately not feeling like I've been starving myself. For that time period and up to now, I've been eating Greek yogurt every morning with granola and honey (unweighed) and nothing else until around 12 am which is usually a snack of some sort. Recently, about a week ago until today, Greek yogurt has started to upset my stomach and kinda makes me sick, presumably because I'm getting tired of it, so instead of Greek yogurt I eat two moderately sized oranges. Throughout this whole process, I've been going to practice for two hours every day from Monday to Friday and resting on the weekends.