I'm having some serious electrical issues wit my 2005 fx35. Urgent advice needed

What is your question?

I came home one evening from work and noticed my head lamps were turned on even tho the switch was still turned off. My front wiper stopped working except for the rear one, my AC compressor doesn't pick up, it's just blowing warm air, and the car loses power while idling, it drops below 1 on the speedometer, and when i step on the gas-pedal nothing happens, it doesn't power up the engine. I took it for check up and i noticed that when the electrician touched one of the fuses in the fuse box behind the battery, the car got power and fired up the engine normally when i stepped on the gas pedal. But other faults mentioned stayed the same, (i.e: the front wiper not working, AC Compressor not working, the rear glass heater not working, and the head lamp stays on even with the switch turned off). He went ahead to test all components i mentioned above separately, by short circuiting them with a cable and connected them directly to the battery, they all worked, i.e: power got to the AC compressor, wiper, e.t.c. He advised me to change the fuse box behind the battery, but i think that might not be the problem. Please any advice for me?