Yes, it is completely normal. A typical menstrual cycle can range anywhere from 21 to 35 days, so your 21-to-27-day cycle is well within a healthy, normal range. Your daily thyroid medication, Thyronorm (levothyroxine), works to balance your thyroid hormones, which actually helps regulate your menstrual cycle. It is a very reassuring sign that your body is responding well to the therapy. Please continue taking your medication as prescribed, and mention this to your doctor at your next routine check-up for peace of mind.

Take your Thyronorm (levothyroxine) on an empty stomach with water, 30 to 60 minutes before breakfast. Please avoid soy, high-fiber foods, calcium, and iron supplements close to your dose, as they can block its absorption. As your thyroid levels stabilize with this daily medication, your metabolism will improve, which gently helps with weight management, eases fatigue, and reduces anxiety. Be patient with yourself, as it takes a few weeks to feel the full benefits.

It is very likely that stopping your Zonisep (zonisamide) after six years is causing these symptoms. Suddenly halting this medication can disrupt your nervous system, leading to blood pressure fluctuations, body cramps, and that strange sensation in your head. While your daily Thyronorm (levothyroxine) is important for your thyroid, abruptly stopping zonisamide is the most probable trigger here. but it is very important that you contact your doctor immediately. They can help you safely manage this transition or adjust your dose to keep you safe and comfortable.

Please do not stop or lower your dose of Thyronorm (levothyroxine) without consulting your doctor first. Managing thyroid hormone levels requires a careful review of your specific lab numbers, like TSH, alongside how you are feeling. Stopping your levothyroxine suddenly can cause your thyroid levels to drop, leading to symptoms like fatigue. I gently encourage you to share your test results with your healthcare provider so they can safely guide you on the correct dose.

You should continue taking this same dose. Stopping or changing it could cause your thyroid levels to fluctuate again. To keep you feeling your best, it is important to maintain this routine and have your levels checked periodically, usually every 6 to 12 months, as advised by your doctor.

Your current TSH of 0.330 uIU/mL is in a great range for conception, so you should continue your current dose of 100 mcg of levothyroxine for now. Once you get a positive pregnancy test, your body's demand for thyroid hormone will increase quickly, and your doctor will likely need to increase your dose. Please contact your physician as soon as you confirm you are pregnant so they can check your levels and adjust your medication safely to support you and your baby.