Without the seed, you're boned.

How did you manage to create a Watching-Only wallet though? Mycelium creates HD wallets that are all recoverable with the same seed phrase.

What do you mean by "password"? Are you talking about the 12 word seed phrase, or the PIN? If you have the 12 word seed phrase of your original wallet, it should work with the next HD wallet you created. In this case you would need to reinstall Mycelium.