Mirtazapine (Mirtaz 15) is helpful for sleep, but next-day dizziness and irritability/anger are known side effects. You should not stop taking it abruptly to avoid withdrawal symptoms. Please consult your doctor to safely taper off this medication. Depending on your medical history, your doctor may suggest safer alternatives for anxiety-induced insomnia, such as low-dose Trazodone, selective melatonin receptor agonists (like Ramelteon), or dual orexin receptor antagonists (like Lemborexant). Additionally, Cognitive Behavioural Therapy for Insomnia (CBT-I) is a highly effective, drug-free option. Your physician will help determine the best and safest transition plan for you.