Cruise Control problems of the 2009 Dodge Grand Caravan

Returning home from vacation while exiting interstate to merge with oncoming traffic at approx 60/65 mph I tapped the brake to disengage the cruise control and the vehicle to accelerate rapidly. I applied the brakes with all my force but it continued to accelerate. I was finally able to get it to the side of the road put it into park and shut the engine off. , in a few minutes I restarted the motor and the car seemed ok. We drove a short way and stopped at a hotel for the night. The next morning as we started home the vents suddenly began to blow out very hot air . Neither the heat, air or fans were on. After pushing the hvac buttons no ne of which were lighted the air suddenly stopped. I turned the air back on in a few minutes and everything worked. We drove to our dealer hendersonville cdrj and got an appt for this fri morning. The man didn't seem to have any idea of the problem. On our way home the horn started to beep intermittently for a few seconds at a time. We have not driven since then and will not until we take it back to the dealer on Friday. Xwe are a retired senior couple, my husband is disabled and this van is our only vehicle and it is frightening to have been placed in such a very dangerous situation. Hopefully the dealer will be able to identify and correct this problem.