I both emphasize and sympathise with OP, having experienced most of her problems at different times. I've been with the same surgery since the age of 4 (now nearly 74) and seen it through many, many changes in their systems. BUT, and this is a crucial BUT, if they try something new and too many people struggle with it and/or complain they take steps to amend it. Not immediately of course, but it is well worth pointing out to them when their systems are not working for you. Nicely, of course. I have sometimes found that they can suggest an alternative method that suits me better.
Last year I was diagnosed with, and treated for oral cancer. The radiotherapy (temporarily thank goodness} caused a red raw mouth and difficulty in swallowing tablets (I choked several times). They would not prescribe liquid forms of some drugs due to the excessive cost. I'n afraid I lost my rag a bit with the GP concerned but to give him his due he discussed my situation with the senior GP and was given an increase in his monthly "prescribing limit". He actually rang me to apologise for his initial refusal - and is now my favourite GP!!!
None of this excuses what the OP has experienced when she is feeling so ill and out of the loop with it all. Dammit, it should be no surprise to anyone that there are more older people nowadays and many still contribute a great deal to society, but not everyone is a technological whizkid (or a "whiz" at much at all!) and not everyone has family and friends who can support them.
I do hope you get it all sorted soon.