I was posting to Tony, the poster above. As for your fast, not every fast will be same. Your body is being balanced and headache, nausea, dizziness are all symptoms of body dumping toxins.
I would look at it as an experience, do not feel bad, 3 days is a good achievement. I have broken few of my fasts in a day, two days of three days, when I felt something does not feel right.
I am at a stage now that after so many years of fasting I don’t get these symptoms. If you do short fasts you will get three too.
You can eat raw plant based diet for 7 to 10 days and fast again for three days.