Okay so I've been taking Claritin D for about a month. I've been feeling great anxiety wise and I haven't been tired at all. I stopped taking it for 3 days because I feel like I didn't need it. I felt very tired and anxious as you can see from my thread yesterday. I decided to take it today because my nose was stuffy and I feel good again. Is there an upper in the medication? I know this sounds crazy but can anyone relate?