Thank you for your query at DoctorSpring.com
I will like to assure you, you definitely did not consume too much water. Such acute hyponatremia can only occur if someone consumes 5-6 liters of water in 1-2 hours. An average person can drink up to 5-6 liters of water in a day. The excessive thirst is due to the alcohol, and will slowly get better.
You can take Cap. Omeprazole 20 mg to prevent acidity as it can be an accompanying symptom. So, please do not worry, you just need to rest adequately, and you will be fine.