Im sick of this sh*t, everythings running fine then something breaks or doesnt work. Now it is the whole bloody motor

I drove my car to the exhaust shop today (strait out of the xtractors) and got my exhaust welded up, lovley. Driving home loottts of play in the rear end and its swaying all over the highway, pull over and only one nut is on the rear left hand side wheel, f**k. Fix it drive home, car acting fine but not idleing the whole morning, just rev's die and then engine cuts out (thought vaccuum leak as new manifold & not blocked off holes properally).
Park it at home and decide to give it a bit of a tune and see whats going on. Try to start it CLUNK CLUNK CLUNK, wat the....

First thing that popped into my head is 'oh sh!t i have a seized piston' soo i try to crank it by hand and it wont budge past TDC of no. 2 & 3. So i look down the spark plug holes & low and behold a see a hairline crack on the top of no.2 piston. HOW DID THIS HAPPEN.......
But all around it it looks like rust but theres never been water in the bores.

It cant be oil starvation i think as it has been working fine up until now & the oil pump runs off the cam so it will get everywhere yeah? The oil pressure solinoid wouldnt make a difference if its stuffed would it?

I will pull the head this sarvo & see if any more diagnosis

I am so pissed off right now, so much money + time has been poured into this car & this is the thanks i get

Dave