Missing Temp for 2 Days, New Temps Keep Falling off?

Like their name suggests Temporaries are not designed to be placed for long periods of time (2 weeks) is enough. The only issue i would address is when your permanent Crowns will be ready.

You never mentioned in your question why the temporaries have been on so long.  Normally a temporary is worn for only 2-3 weeks.  Temporaries can come off for a variety of reasons.  I would not necessarily worry about it. 

Front teeth temporary crowns require a lot of finesse. I doubt that you had any significant teeth shifting, nor is that likely the issue with the new temporaries coming off.

I suspect that there is some subtle misalignment in the bite (or rather the sliding) on your new set of temporaries. This probably also explains why you are awakening with an achy jaw as well.

Go back and tell your dentist about your frustration with the temporaries coming off multiple times and about the jaw trouble you are having. Hopefully he will find whatever is off in your bite. That will make your jaw feel better and keep your temporaries on better.

When it's time to put your front crowns in, make sure you really preview them BEFORE you let him permanently cement them in. Make sure they look great to you first. Sometimes they need to be modified or touched-up before they are permanently cemented.

If after having your temporaries adjusted you continue to have as many difficulties, then you may want to consider a second opinion with a very experienced cosmetic dentist before the rest is finished.