My water well was working fine till I replaced pipe because of a leak at the pitless adaptor. The leak is fixed but now the pressure won't go above 17 and after about 10 minutes it sounds like it's sucking air down in the well. When it does that I can't see any water at all where I used to be able to see the top of water line. The well is approx. 45' deep and water line is around 19'. I did accidently pressure up to 90 with valve closed. What could my problem be? I can't believe the well could have "gone dry" just like that.