Drilled wells often will change as the water bearing veins open up from pumping. Sometimes the water gets better and sometimes it gets worse. Lucky you. Like it or not you are going to have to get a water test done before you can make an intelligent decision as to how to treat the condition. Shocking the well repeatedly is never a good idea because the chlorine is not good for the pump and if you have a steel cased well will cause problems with that also. So.......have your water tested and get back to us.