camera technical help

hey guys i need some advice.my camera that i muse for models has packed a sad and i dont know why or if its repairable.Its a sony digital which is around 15 years old.last night i went out for meal.tried to take some photos in house before going out and it would not work.so bought some new batteries,put them in and drove 15 minutes to resturant.when i went to take camera out of pocket it was hot to the touch.only cooled down when i tool out batteries.symbol on screen showed battery symbol with lightning flash through it.after camera cooled i put batteries back in and it imediatly heated up again.this are lithium batteries.took them out. and gave up.this morning i notice battteries are damaged and swollen.i know there have been instances of lithium battery fires but im more worried i have fried my camera.any serious thoughts would be helpfull.dont know if its economical to get repaired or whether to bite bullet and buy a new one
thanks