Brake Sensor problems of the 2002 Nissan Altima

Ok 3 or 2 week after I brought the car it start running hot the it start to get to the point when it do run hot and I hit the gas the car want go it was like I was trying to make the car go fast but it was going slow so I took it back to the place I brought it from and he didnt do much so I found a mechanic and he ran at test on me and told me that it was some recalls on part of my car and the person head it before me didnt get it done like the cam sensor ,crank sensor and my catalytic converter and a time thing the I took it back to the place I brought it from he said he can do nothing and someone told me to turn to you all so what can I do I put to much money in to it to get it fix I change the water pump the holes and the thermostat so what should I do please help. . . .

As I was driving the road at a good distance from the vehicle in front of me, the other veh stopped suddenly. I put foot on the brakes but I skid to his rear bumper with my front end. I was traveling about 40 miles per hour. The passenager side air bags deployed and the seatbelt tighten, but mind did not. Which caused me to strike the steering wheel and multiple injuries that I'm still suffering. When my vehicle was take to mechanic , he stated my air bag sensors were not activated and he stated that I did not have anti-lock brakes which could have caused me not to have the accident. I purchased the vehicle from a local dealership in July 2007, before purchasing I had firestone inspect the veh for any defects or mechanical problems. They never said anything was wrong with my sensors or that I lacked anti-lock brakes. The dealership was to have done a safety check on my vehicle and I was never told that my vehicle had a recall for air bags. Had I known I would made it was fixed before purchasing and I would have not suffered injuries. My vehicle was totalled from that crash anther other vehicle a 2006 Nissan maxim had a couple dents and scratches. My vehicle was totalled on 03/17/08 and I'm still going to the doctor for pain. I do not know what to do about this issue but I going to make sure something is done very soon.

1. Vehicle's exhaust pipe hanger caught bag of debris from the road and felt like the car was falling apart in the rear. Debris was removed by discount tires after purchasing new wheels and tires. 2. Service engine warning light is on. Engine has reduced power and it causes the engine to stop running without warning during operation, with vibrating noises. Nissan states that the cam sensor with crank sensor is faulty and should be replaced. Apparently it is under recall and they want us to pay for a recalled item. 3. Engine long block was replaced on 2/14/06 because of catastrophic engine failure, and the engine continues to have problems with vibrating and sluggishness. 4. Rear engine mount replaced in 11/03/04 as recommended. Now, passenger upper mount was recommended to be changed on 3/14/08. 5. Air conditioning is blowing hot air and we replaced air conditioning high side compressor and oil recharged system in 6/01/07, as recommended. As of today 3/30/08 air conditioning is blowing hot air again. We purchased new wheels, tires and brakes because of the vibration in the car and steering column with low sounding noise. We have consistently taken our car in for maintenance, recalls and additional mechanical problems with very minimal resolutions. Thank you.