Can the harmonic balance come loose?

Been where you are, I'm sorry to say, - find out what the problem is,, it could be the balancer, I've not seen a broken one, but others have,,

You'll likely need a puller to get balancer off, (if it's cracked as Rusty says, you wont need a puller), some have said you can borrow tools free from Autozone. (deposit required)

You'll not only find knowledge here,, but support as well.. hang in there,, it does get better,,..

Remember the smiles and the miles.. and the **** faced grin after a smoke show.. it'll happen again...