I'm sorry to hear that you're experiencing a blown head gasket. A blown head gasket is a significant engine problem that can cause various issues and affect the overall performance of your vehicle. Here's some information that might help you understand the situation better:

1. **What is a head gasket?**\
The head gasket is a crucial component that sits between the engine block and the cylinder head in an internal combustion engine. Its main function is to seal the combustion chambers and prevent coolant and engine oil from mixing.

2. **Causes of a blown head gasket:**\
Several factors can lead to a blown head gasket, including:
Engine overheating: Excessive heat can cause the head gasket to warp or crack.
Engine problems: Issues like a warped cylinder head or engine block can put extra stress on the gasket.
Cooling system failure: A malfunctioning radiator, thermostat, or water pump can cause overheating.
Improper installation: If the head gasket wasn't installed correctly during engine assembly or repair, it may fail prematurely.

3. **Symptoms of a blown head gasket:**\
Some common signs of a blown head gasket include:
Overheating engine
White smoke from the exhaust pipe
Milky or frothy oil on the dipstick
Coolant loss without any visible leaks
Bubbles in the radiator or coolant overflow tank
Engine misfire or rough idling

4. **Repairing a blown head gasket:**\
Repairing a blown head gasket typically involves disassembling the engine, removing the cylinder head, and replacing the damaged gasket. This is a complex and laborintensive process that should be performed by a qualified mechanic. In some cases, additional repairs may be necessary, such as machining the cylinder head or engine block if they are warped or damaged.

5. **Cost of repair:**\
The cost of repairing a blown head gasket can vary depending on factors such as the make and model of the vehicle, the extent of the damage, and labor rates in your area. Generally, it is an expensive repair due to the amount of labor involved. It's a good idea to get estimates from multiple reputable mechanics to compare prices.

If you suspect a blown head gasket in your vehicle, I would recommend having it inspected and repaired by a professional mechanic as soon as possible. Continuing to drive with a blown head gasket can cause further damage to the engine.