7 lbs is very doable. Not sure about the dizzy spells. I remember getting them the first few times I did pure IF. These days I eat vegies during my “fasting” period as the calories are negligible, but my body still gets some nutrition and I haven’t had dizzy spells since.
I’m 6’0” tall and I lost 7 lbs per month. I’d advise drinking about 5L of water per day - keeps you full and oddly drinking more water prevents fluid retention, or so I read.
I like using LoseIt to track CICO.
During my first week of fasting, I felt sick every day but now I guess my body adapted because I can go a whole day without eating and feel fine and energized.
Maybe your body just isn’t used to this change, especially if like me, you had really unhealthy eating habits before fasting.