2002 Buick Regal

Electrical problem
2002 Buick Regal 118000 miles

I bought this car used 7 weeks ago. In that time, I have put 5000 miles on it because of my job. I had the car 1 week and was driving on the interstate when I hit a bump. All the dials on my dashboard went dead. I had no odometer, speedometer, gas gauge or anything. The digital readouts on the radio and a/c got very bright. With the car off, I pulled every fuse in the fuse panel and started the car again. The dials righted themselves. Because of the traveling that I do for my job everyday, I have this problem every day or every other day. I was able to identify the problem fuse, it is labeled RADIO, HVAC, RFA, CLUSTER. It became worse 2 weeks ago. I was driving a long distance (300 miles) and had to pull over 5 times to take the fuse out and put it back in. I am now having problems with the previous mentioned fuse and another one that I was able to identify, the RADIO PREM. SOUND. Sometimes, I don't have a lighted dashboard. None of the fuses have burned out, but pulling and replacing the first always works and jiggling the second fuse until the lights come back on works. What could be causing this? And how can it be fixed? I took it to a mechanic who found a short in the headlight switch and changed that out and the wire connected to it.