2001 Questions for all other cars headgasket

Engine Mechanical problem
2001 Questions for all other cars 69000 miles

help. Help. Help. Where do I start?I have a mg zr 2001 1.8 160. Bought it in 2004 with 40k on the clock.2005 otherhalf crashed in to the tree. Had it repaired but was sitting for a year. Back on the road for 3months then started overheating was told my garage was water pump got that done. Few months later lost power on duel carriage way and white smoke came out. Left it with a garage they fixed said it was dirty oil?Grand for few months then overheating back the garage then new water pump and belts grand again for for months when it blew again. Cinlinder busted-headgasket. Got that done -then again it blew few months later. Brought it back they swore they did the work. But looked at it again. They said another cinlinder cracked again. They put a new set on and told me to sell it. Now car sits outside. Drives fine-but its off the road with white smoke coming from exhaust. Ive spent so much on sorting these promlems out -is there any life left?Is is woth fixing?Only 65800 on clock. Is it scrap?How many headgaskets is there in a car?I really dont trust garages anymore:)any idea how much this would cost?