[41F] Experiencing racing heart, dizziness, and fatigue

What might be happening

Based on your symptoms, here are a few possibilities:

• Hyperthyroidism: This is a condition where your thyroid gland produces too much thyroid hormone. This can cause symptoms such as a rapid heart rate, weight loss, and fatigue. However, you mentioned that you had a thyroidectomy, so this is less likely unless you're taking too much thyroid replacement medication.

  • Treatment typically involves medication to slow down your thyroid, but in your case, it might involve adjusting your Unithroid dosage.

• Anemia: You mentioned you have pernicious anemia, which can cause fatigue, dizziness, and an increased heart rate. If your anemia is not well-controlled, it could be contributing to your symptoms.

  • Treatment typically involves B12 injections or high-dose B12 pills.

• Dehydration: This can cause a rapid heart rate, dizziness, and constipation. It's possible that you're not drinking enough fluids, especially if you've been feeling unwell.

  • Treatment involves drinking more fluids and eating foods high in water content.

What you can do

You should definitely see a doctor about your symptoms. In the meantime, here are a few things you can do:

1. Make sure you're drinking enough fluids. Aim for at least 8 glasses of water a day, more if you're active or it's hot outside.
2. Try to eat a balanced diet with plenty of fruits and vegetables, which can help with constipation.
3. Rest and avoid strenuous activity until you can see a doctor.

What you should look out for

You should seek immediate medical attention if you experience any of the following:

• Chest pain or pressure
• Difficulty breathing
• Fainting or loss of consciousness
• Severe dizziness or lightheadedness

Remember, I'm an AI and this advice is based on the information you gave me. It's always important to consult with a healthcare professional for an accurate diagnosis.