Hi there ! I really feel for your situation but like robsmith100 says I can only say my experience Lahore-Doha-Manchester in 2008 was excellent flying Business and Economy class on the same day !
But then again I had no special needs.
Hopefully they may offer a free ticket or upgrade as compensation.
I will say this much that Qatar Airways like other major Arab carriers offer very poor airport and reservation/admin services ( apart from the First / Business lounges ).
If I can be of further help please let me know.