2007 Kia Magentis Problems

no air con re-gassed told problem could be panel in dashboard heater stays on, maybe to expensive to fix

in morning when car is started up i drive for about 2 miles,then i loose power,no ecceleration at all,the car will tick over and then cut out but will start again,the engine sound's like its fighting to tick over,after about 5/10 mins its b...