Can you post your actual test results for us, along with the reference ranges from your lab report? That would help us determine whether or not you're on an adequate dosage.
25 mcg is a very small dosage and is, typically, only a starting dose. It's not unusual for symptoms to get worse, or for new ones to appear, when starting on replacement thyroid hormones or changing dosages.
Have you, actually, taken your pulse to see what your heart rate is? Low heart rate is a symptom of hypothyroidism and should start coming up if your thyroid levels are rising, but again, that would depend on your starting levels