So sorry to hear about your pup Jax. I'm not sure what vet you go to but it may be time for a second opinion. Two months with no real relief is not good for your little pup.
I can refer some vets,
I go here:
SAHARA PINES ANIMAL HOSPITAL phn 702 876 7580
DR KRISTINE ZIEGLER OR DR CHRISTINE BERCIER
6533 W SAHARA AVE (at Torrey Pines)
they are closed Sundays but open at 7 am on Monday
here is their website
Sahara Pines Animal Hospital - Las Vegas, NV - Home
Another possible vet: (I have not been here but a local dog rescue I believe in thinks highly of them)
LEGACY ANIMAL HOSPITAL 702 263 9004
DR SUSIE COSTA
2591 WINDMILL PKWY
HENDERSON NV
they open at 8 am on Monday