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!

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.

A month wait is too long if your temporary crown came out.  It is also a concern if the filling under the temporary is also falling apart.   I would recommend you see another dentist to temporarily help you out while you are waiting to see your own dentist.

You really need to see a dentist as soon as possible, a month is too long to wait. If the composite under the crown is broken down, then it will need to be redone and the crown re-prepared. Most of the do it yourself temporary cements don't work that well for very long (if at all), and if the tooth breaks you might need a root canal or an extraction.

There is nothing YOU can do. See a dentist to build up the tooth stump with composite core materials and make you a new temporary crown.