Since you have struggled with insomnia for two years, this is considered chronic. I strongly advise against self-medicating. For chronic insomnia, the first-line, gold-standard treatment is Cognitive Behavioral Therapy for Insomnia (CBT-I), which addresses the root behavioral causes. If medications are necessary, they must be prescribed by a doctor. Prescription options might include orexin receptor antagonists or specific sleep aids, depending on your health profile. Over-the-counter aids (like antihistamines) are not safe or effective for long-term use. Please consult a healthcare professional or sleep specialist for a proper evaluation and a safe, personalized treatment plan.