I have a submersible pump in a 150 ft well. Bladder tank and 35-50 pressure switch plus whole house filter. Bladder tank, pump, and switch were replaced 4 years ago, filter replaced three weeks ago. Kids toilet was left "trickling". Came home to no water. Manually turned pressure switch. Pressure came up but ran out in about 30 seconds. After a few cycles lost pressure altogether, no water. Tried again twice more with same results. Any ideas?. Thanks in advance for your much needed help.....