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You can install alternative android distros on an android phone that will keep updating long after the manufacturer has stopped. For example lineage OS which supports lots of devices (but not all).
There are also Linux distros targeted to mobile devices.
You just need to pick a device that is supported when buying.
Its really hard to day without more information. You should talk to a doctor. Some other things that could be causing this that noone else has mentioned yet(I can’t tell if this applies for you or not based on your post):
Remember that many people have had similar problems and overcome them. You will just need to work out what works for you. Good luck.