I left my business temporarily to care for my sick mother. My partner changed locks and is raising hell with me about lease payments and credit card. I own the LLC, he is just a partner with no written agreement other than the lease... What can I do?

There are various things you can do in a closely held company partnership dispute, like file a temporary restraining order to let you back in, but to really determine what's going on, any attorney would need much more information.  You should reach out to an attorney to discuss the situation in more detail.