Yeast Infection while on period + change in diet

I recently found out I had a yeast infection (I received medication for it) and I got my period but it’s not my usual schedule. I usually have it towards the end of the month. But it stopped once I lost my virginity. It’s been overwhelming because it seems that a lot has been happening to my body, because I think I have the flu too (body aches & fever at night) Is this a concern? Is it normal? And apparently the cause of my infection is because my diet hasn’t been healthy. (Too much sugar and carbs) I don’t know where to start to make it better.