Live feeding is not illegal but very much frowned upon, and should only be done if the reptiles life is in danger, eg will die in the next few days if it does not eat. (This is for Qld, not sure of other states)
Two months without food is of no concern, they are amazing creatures and can go a very long time without food. My 6yr old spotted only feeds for six months of the year, he stops in April and resumes October, he always has done this, his temperture never changes as he isn't being used for breeding. He only loses about 50gm over the six months.
There is some good advice on here, but the main thing is finding a good vet, some antibiotics don't cover everything, although Fortum is a fairly broad spectrum, even if your vet is not a specialist, he will be able to access fellow veterinarians, also he should have access to something call Veterinary Information Network, this is used for this exact thing, it is for vets only, and they post questions on a forum like this (without the snarky remarks though and yes I have been known to give snarky remarks too) so they can get the advice of people who do deal with reptiles all the time. It is world wide so generally always someone can help at any given time.
At the moment keeping up with the soaking (supervised) and making sure your temps are correct and seeing your vet again are the three most important things at the moment.
Don't worry about feeding at the moment.
Have you got a thermometer so you can keep an eye on the heat mat temperture and a thermostat so it can stop it getting too hot if you are not there, these where mentioned near the start of this thread so I am sure you have gone out and purchased these items if you didn't already have them.
Once you python is better, perhaps find a reptuable member on here who can give you the correct advice in regards to set up, heat, feeding etc via email or PM's, as I agree I certainly would not let anyone into my house.
You may have had the snake 3.5yrs but as someone said they are very hardy, so perhaps things have been wrong for a long time and finally something pushed it over the edge, such as an injury from live prey.
This is all just in my opinion.........