Welcome to the forum, I'm very sorry to hear about your foot. My only suggestion is to look into
Hyper
baric
Oxygen
Therapy. It's free if you have MS but I'm sure something could be done as I pay £20 a session and even with 15 1 hour sessions that's £300, which has to be cheaper than an amputation and subsequent help and assistance.
So long as your right foot is not going nasty and it's just a case of not getting better quickly for their liking, there's time to have a go. I go to The Chiltern Multiple Sclerosis Centre in Wendover, Bucks. I'm told that there are over a hundred of these centres across the UK and that's without all the private clinics that have one. In fact if you have several thousand handy, you can buy one.
Used primarily for people with MS, it is also used by people with ME, Fibermialgia, sports people with injuries as it speeds up the healing process, just the ticket for you.
If you can't find anything try
https://www.hyperbaricoxygentherapy.org.uk/find-chamber and put in your post code. I'm more than happy to go into my place and ask if they know of other places that might not be widely advertised.
It has been used for people in your situation and has been successful allowing people to avoid amputation.
Good luck and please let us know how you get on.
I don't want to be a nag, please act now because I don't think even doctors know about this. It has to be worth a go. Good luck.