The new housing rules are so hard to understand. I know if you place you can not place or take another house for 7 days. but Seems to me if you give your house away you should be able to take another since you didn't place.
UO web site states:
"If a player places a house, has a house traded to him, or sets a house to Primary, a one-week timer begins. During that time, he may not place another house, have another house traded to him, or set another house as Primary. However, that player can still give away any number of houses on any number of shards without restriction.
Note: You can find out whether your timer is still active by double-clicking a house placement tool. If you still have a timer, it will say, "You must wait __ hours to place a house." Otherwise, you'll just get the house menu, which you can then cancel."
I see no reason why you should not be able to take a new house. But then again any more if we are trading house we open and account to hold the house in case of stuff just like this.
You could try asking the GM but I'm sure you will only get told to send in a bug report or go and read a web page somewhere.
If you are in danger of losing you stuff I suggest you open a new or closed account to hold your stuff un till the game will let you take new house.
You could also if you have space make temporary new char's to hold your stuff, or ask a very very trusted friend to help you store your stuff