anyone please,

the other day when i pushed my lighter in it shorted out.since then i just get a buzzing somewhere down by the fuse panel,when i hit the horn,or my tailgait window open button.i`m also having the problem of ,when i open my door my stereo shuts off,and having saved the best(worst) for last my dome light no longer works,and if i have the wheel in the dome light on position,everything i mentioned above happens at the same time.I`ve tried my best to find somewhere there may be a short (i`m thinking a ground somewhere) although i`m definitly not much of a mechanic.does anyone have any kind of suggestion,this is driving me crazy........................thanks SVTAG