Did I just make the problem worst?

I haven't driven my 1967 mustang in two weeks. After warming up the car I began to turn the wheel and it was back to "NO" power steering. I knew I had a leak but always thought it was a small oil leak. I checked the power steering and it was empty. I had no other car available and decided to drive the car 4 miles with about 12-15 turns. I filled the revoir up and checked and everything was back to normal! I then parked at a store and saw a trail F#%$ck It was leaking the whole way! So what can I expect as the worst case scenario and what can I expect at the least? I'm leaving and don't get back after the weekend so I won't have time to investigated. Thanks

It did make a faint whine but went away. When I drive straight nothing and when making turns at 30+ a little noise. At 5 MPH it sounds horrible but that's after I leaked every where and probably near empty of power steering fluid. When I did fill it back up it was good as new but as it leaked the sound got worst.

If the pump is shot, can I just drive it without the power steering? And if I do have to replace the pump whats the average price and overall best pump for the money? Or can I just replace the campack inside the pump? Thanks everyone.