Would your milk run out in the future if you use pump only?

I dont believe that is fully true it depends on the body, my sister in law pumped exclusively until her baby boy was a year and she just stored the milk. Are you getting enough rest( i know its hard with a newbaby) are you eating properly? Try to drink lots of liquids when you pump or nurse try to drink a gl of water while your pumping. Oatmeal for breakfast also can help they have tea's and pills and you can ask your dr if you need help or find a lactation consultant in your area. Hope it works out for you dont stress yourself and dont give up :)