Even if you are examined by a doctor, you have pain for which you don't know the cause, so it must be painful, and you are probably also having mental pain that is difficult for those around you to understand.
I don't know about the pain itself, but I think one is due to causes unknown with current medical technology, and the other is due to mental causes.
I'm a monk, so I'd like to think about the latter, where spiritual things are the cause.
As for myself, I live in a rural village in Shiga prefecture, so although I have various problems, I can say that I am blessed with an environment that includes eating habits. Since I'm in my fifties, I have a lot of body aches, but since I can make and eat vegetables, etc., it can be said that it's easy to maintain my physical condition. It's quiet, so it won't interfere with a good night's sleep when you sleep.
Since you are working part-time, you are not in a situation where you are restricted in terms of your place of residence due to your work. If there are no restrictions such as taking care of parents, etc., and it is possible to live in the countryside, there are many mountain villages etc. that are looking for young people, so moving to such an area may be one way.
Living in the countryside also involves various kinds of suffering, and since it's far from a utopia, it's better not to have strange fantasies, but I think it's just one method. What do you think.