My 1993 Nissan Altima might have electrical problems?

My 1993 Nissan Altima Has Been Running Good But Recently, The Right Side Brake Light Went Out, I Bought A Bulb To Replace It But It Was Working Again. A Few Weeks Later The Dash Light And Light Where The Shift Gear Is Went Out. Now I Got Pulled Over Because Both Taillights Are Out. But The Dash Light Comes On Every So Often And When I Push On The Brakes The Time Light Flickers And Sometimes Goes Off. I Think Its When I Hit A Few Bumps It Knocked Stuff Out Of Whack. The Cop Said It Might Be A Fuse But The Dash Light Comes On When I Hit A Bump And I Hit A Big One Yesterday Before The Tail Lights Went Out. Do You Know What This Might Be? Thanks