At first, don't be afraid it's just a fistula. There is painless, permanent and a very effective cure present so you don't have to worry about it, you will definitely get better.
First of all get all your investigations done as suggested by the doctor to rule out any other pathology associated or not.
Next Steps
After the investigations and the final diagnosis, consult a Homoeopathic Doctor and ask him/her about the same and then he/she will confirm you that if this is curable or not because that totally depends upon the condition.
If it is at the level where we can cure it without any surgical interventions and one will definitely do it for you otherwise i hope it'll come out that bad you will have to go for a surgery, but it's a minor operation and you don't have to worry.
Health Tips
Helpful tips for you in my opinion would be, first consult there and ask them you are planning to travel with the same, is it okay? if they allow so then welcome and travel with all the precautions.
You can also opt for online consultation to a homoeopathic doctor, so that you don't have to wait for a month.