I think your body is showing signs and you need to go to the doctor and maybe get a few opinions if there are risks to the treatment. I have no idea what your dx is but for many dx prompt treatment is key. As for the visa listen your health is number one and if you have severe health issues little else matters. As for waiting I would really look at why you want to wait and see by the doctors if that is the appropriate thing to do. With some health issues it may be but for some it may make things worse.