For your throat irritation, spicy foods may be causing mild acid reflux. Try avoiding triggers and sipping warm water. Regarding your fatigue, iron supplements can take several weeks or months to fully rebuild your iron stores and relieve tiredness. Additionally, make sure you are not taking your iron with tea, coffee, or calcium, as these block its absorption; taking it with Vitamin C can help. I highly recommend consulting your doctor to recheck your hemoglobin and ferritin levels to ensure your current iron therapy is working effectively and to safely rule out other causes for your ongoing fatigue.