I was booked on a UA Ticket IAD-FRA-JED-FRA-IAD in business class.
UA 952 got delayed on 12/16 in IAD. Missed connecting flight LH 592 on 12/17. The EU weather related cancellations created further chaos in FRA. Finally UA rebooked me on Qatar on 12/17 via Doha evening and said bags are being held "In Transit". Quatar assured bags are on the plane, I was in FRA for 8 hrs.
16 hours later, arrived in JED and no bags were found.

Quatar says it is LH problem.I filed a PIR (property irregularity report) with Quatar, no estimate on when they will arrive.I am on a business trip and had all formal wear in the bag. So decided to go ahead and shop necessities for a few days. I leave JED this Thursday.

In short, can I hope to get the bags before I leave?
Where do I start calling LH or UA or Qatar?
Does Qatar re-tag the bags or stay with the original?
The Quatar guys took the baggage claim tag for filing the report, but gave me the tag number UAxxxxxx. Do I need the tag to claim if bags are lost?

Appreciate any advice on this so that I can plan ahead for the worst.