well eating healthily is more important if you have low blood pressure than if you have high blood pressure so i would say that was good advise

My daughter has low blood pressure, the doc said it is better than having high blood pressure.

All he said was to drink more....

he also said that she might need more salt in her diet.

Appropriate treatment for Hypotension, depends on the cause, so your GP should be focussed on determining this, in order to be able to assess the risk to your health.

The article below will provide you with more information;

http://www.medicinenet.com/low_blood_pressure/article.htm

This is no place to be acting on any treatment or lifestyle advice given. You must seek help from the professionals. From what you say it seems that your GP might be a little dismissive so why not try seeking some advice from the British Heart Foundation:

http://www.bhf.org.uk/contact_us.aspx

Drinking through a straw increases blood pressure temporarily. Your blood pressure will increase 10 - 15 points whilst you are wearing a wristwatch.