Hello,
I apologize for the delay. This case is likely too complicated and difficult to provide much assistance via text.
In all of these cases I think it is best to contact as many local rescues and pet care providers as possible. This might mean reaching out to your local shelter and veterinary college. You can also start a go fund me page. Post on all social media accounts and personal accounts. Start with general practice vet who the rescues recommend. Give them a realistic budget for you. Ask about payment plans and payment plan companies like care credit or vetbilling.com. There are places to help. Keep trying and keep asking.
Hello,
There are still quite a few old timer vets who may be in your area and willing to help. Call everyone around you. Try to avoid the corporately owned clinics, and ask for a reference from everyone at the local shelters, rescues and via every social media outlet you use (facebook, nextdoor, etc). In many cases if these are older cats then these are either masses due to chronic infection and inflammation, or a neoplastic mass.
If this is a younger cat it may be an oronasalpharyngeal polyp.
Keep asking for affordable options and keep advocating for your cat,