The part your story points at that is not medical at all: somebody at home should know roughly where you are.
Not a detailed itinerary. What I do:
One person who gets the outline: country, rough dates, and where I am staying tonight when it changes. A message a day or two, no more.
A shared document with flights, accommodation and insurance details that they can open without me.
An agreed check-in rhythm, deliberately loose. Something like: if you do not hear from me for three days, start asking. Loose enough that a bad signal area does not cause a panic, tight enough to matter.
Copies of the passport somewhere they and I can both reach.
The reason this matters for your situation specifically: when you are properly ill you make bad decisions and do not want to explain anything to anybody. Having one person who already has the context, so that a single short message gets you help, is much more useful than a plan that requires you to be functional.
And for accommodation, when you are travelling alone and unwell: staff at a small guesthouse are usually extremely helpful if you tell them. Two days flat in a room where nobody knew is the avoidable part of your story.