Loose Temporary Crown - What can I do to make my life easier?

I think that the first thing that you need to do is see a dentist before the month period that you are describing.  If your dentist is out of town, perhaps you can see someone else to have it evaluated.  A month is too long to wait.  You may compromise the fit of your permanent crown by waiting.  If part of the composite buildup fell out, the tooth may no longer have enough retention to place a crown.  Your dentist can evaluate the situation and see if he still feels a crown is the best long term solution.  The key is to get in to see him/her asap.  Don't wait!

What a shame that you won't be seeing your dentist for a month. I'm not sure what the reason is for that but if cementing a permanent crown is the plan then your plan is now changed as they most likely will NOT be able to deliver the permanent crown because it will NOT fit due to the breakdown of the crown build-up. You need to get an appointment ASAP to fix the build-up and take a new impression for the permanent crown. You dentist should be available 24/7 or have someone on call for this kind of an emergency.

Good luck!

You describe situation where I must assume either the tooth preparation is too short or the walls are insufficiently parallel to provide adequate retention.  You may have fractured the buildup material that was copied in the impression sent to the dental lab.

It is important that you see your dentist as soon as possible.  This tooth may need to be rebuilt, re-prepared and a new impression taken.  Otherwise you may face a tooth preparation which continues to degrade and a final crown with no tooth structure to properly retain the crown.