As you experience although not quite as extreme. It's been several years of workarounds to be able to use increasingly unfriendly tech. Hand injuries mean I can handle a full sized keyboard but not a phone for general business.
You may have to get used to the verification codes - nearly everyone uses them. I find it's a PITA but need to comply. I purchased (from Aldi) a $50 task light. Like a reading lamp but with an extremely bright LED circle on top and built in magnificaion. I can flick it on when needed.
If you can avoid it, don't use Gmail, yahoo or Microsoft. Arne mentioned Proton mail above. Good choice and Thunderbird is easy to set up on your computer. If you sign up with an account at Proton, and receive your user name and password, Thunderbird *should be able to do the rest of the tech stuff for you.
A small hack for charging your devices - these days most charging connectors are small and black. It's almost impossible to see which way up they go in the socket and you will break them easily. Put a dot of liquid paper on the top side to avoid this. So much for universal design with an ageing world population. 
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