Your blood pressure reading of 127/77 mmHg is within the normal range, which is reassuring. The headache you are experiencing could be due to various reasons, including medication side effects, dehydration, stress, or other causes.

Here are some steps you can take:

• Stay Hydrated: Drink plenty of water throughout the day.
• Rest: Ensure you get adequate rest and avoid stress.
• Monitor Symptoms: Keep track of your headache intensity and any other symptoms.
• Medication Review: Since you are on Telmed H (Telmisartan and Hydrochlorothiazide), headaches can sometimes occur as a side effect. However, do not stop or change your medication without consulting your doctor.

If the headache persists, worsens, or is accompanied by other symptoms like dizziness, vision changes, or weakness, seek medical advice promptly. It is always best to discuss any new or concerning symptoms with your doctor to ensure your treatment is appropriate and safe.To narrow down potential causes, we will need some more information.Please tell me your age and gender.