i had my headers installed well a guy broke a bolt off inside the head so i took it to the mechanic and he retaped the hole annd put a new bolt in the header so i got it home and wanted to look under the hood to see the work that he did well there is now coolant lleaking fromm the new bolt i amm about to go crazy please some one tell me what is and how i could possibly fix it

 

Sounds like the head is either cracked, or when they repaired the threads they used a drill and broke into a water jacket. You will probably have to replace the head to fix it, or possibly it could be removed, welded and re-machined.