It is not unusual for an animal that age to go off feed during the winter it is often seasonal or related to sexual maturity.
An injured or sick BP will often cease to feed nothing unusual here either.
Not eating for a month is really NOTHING, the important is that the animal is well hydrated and not loosing too much weight.
As far as vet getting your snake to eat again there is nothing he can tell you that will be different than what people will recommend here.
Make sure your husbandry is optimal.
Offer smaller prey, BP tend to get a lot more food than what they actually need and feeding smaller preys less often especially for a male will lead to an animal that will eat with more consistency.
Most importantly PATIENCE.
If your animal is 2.5 years or more and a good body weight the fast could last months.
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