Desperate, you've been upsetting your mother for four decades. She would have liked you
to be happy
to grow into a man who could manage his own life instead of asking everyone else what to do in every tedious aspect of your life
to marry a nice woman and have children
to enjoy your career and care about the work you do for your clients
to help people not so well off as yourself instead of all this navel-gazing you do.
Your mother has been disappointed over and over again because she didn't get the son she had every right to expect. She's never let you down, though; she's kept on caring about you. "He arranges to see me, he cancels, then he cancels the cancellation..."
That's what I meant when I said she was accustomed to it. She got past her disappointment long ago and accepts you -- loves you -- exactly as you are. She knows, in her old age, that she can't rely on you for anything, can't even ask you for anything. That's your sister's role, to take care of your mother.
In short, she's a wonderful person, and you should understand that you won't have her for ever. Who else do you think will tolerate being let down over and over again? No one.
So when you want answers to your many questions, whether to have another cup of tea, whether to take this drug or that drug, whether walking harms your health or the million and one other stupid questions we see here, call your mother. Ask her. Talk to her every day. Take her advice, always.
And maybe, just maybe, ask her once in a while how
she's feeling. If she's not feeling too good, if she has any problem at all, ask how you can help. Then, no matter what she says, do it. Help her. Do what she wants you to do.
You have a lot of making up to do, from dumping your misery and indecision all over her to at least trying to make her happy for once before you lose her.