possible BHG how to know if i caused any damage?
 

i believe i may have blown my head gasket, because it goes through coolant faster than it goes through gas. and i have noticed a huge power loss. when i stopped driving today after a short trip less than 5 miles i noticed my coolant was boiling. any idea if it would be possible to just replace the head gasket and be up and running again? or is it worse than that? im sorry i dont know much when it comes to iron blocks specifically 7M-GE.