Nationalism vs Patriotism : Which one better and why?

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I have a confusion between patriotism and nationalism. Loving one's own country is always good. However, when I criticize on any bad policy taken by our administration, friends or readers tag me as anti-national. In India, now-a-days national vs anti-national debate is hot cake. It happened after a nationalist party came into power. I searched in google and maximum of the search results said patriotism is better than nationalism. If patriotism is better, then why and how nationalist parties gets into power? Is there any way to draw the line to differentiate a man is patriotic and not nationalists? I am a proud Indian, but at the same time I feel we have lot of internal problems which need to be rectified. If I pen against them, am I anti-national?