Extreme fatigue

I've been dealing with extreme fatigue lately. I nap around 5 hours a day and I still go to bed relatively early. This is unusual as last semester I did not feel the need to nap at all. I took a blood test last month and my iron was relatively low and I've had my period twice this month after switching birth controls and not having had a period before this since last year. Has anyone experienced this? And have advice. Thank you!