Jody
Sorry to hear about that, its an regreable way to end a relationship.
It takes a lot to split a tank I would think one of the pipes leading to the tank pump has splitor come lose, and the bolt holding the tank has also come lose and thats why you can`t lift up your seat.
Really you need to move the tank into the correct postion so you can take your seat off to have a look under the tank to see what the damage is.
You were lucky you got away riding it 15 miles