I have a family member (same generation as me so not someone elderly) who I am genuinely fond of. She has had mental health problems since childhood and has fairly recently developed some physical/mobility problems too. She lives about 200 miles away so we don't see each other often - until a couple of years ago I would visit her annually and vice versa but unfortunately her physical health now means she can't travel and my current job makes it difficult for me to visit her. She is lovely in person, in small doses, and I do enjoy the times I spend with her. But...
The problem is this. She gets it into her head every so often that I am angry with her, or that there is a Big Problem going on in my life that I am not talking about. Neither of these things are the case. I admit that due to my own neurodivergence I often don't answer the phone, but if I don't answer her calls she calls again and again and again. 37 times in 30 minutes once, leaving plaintive voicemails asking what she had done wrong and if I was angry with her (which I wasn't, tho after 37 phone calls when I was trying to have a day out with my DC I did start feeling a bit tetchy) Or she decides that I must be having a crisis and that I'm not okay and starts ringing more and more to tell me she is here for me (which if I was having a crisis would be the last thing I needed tbh because she isn't really capable of "being there" for anyone!!). I should add that even answering and saying "I'm not angry and nothings wrong, I'm just busy" doesn't help. It just calms her temporarily and then a day or two later (sometimes even less) she starts all over again. It's like she needs there to be a crisis all the time and if there isn't one in her own life she invents one that must be going on in mine!
I don't want to cut contact with her. But I also don't want to have to reassure her constantly and I absolutely can't carry on getting all the bloody phone calls and messages demanding to know what's wrong and why I'm angry with her (when I'm not). It makes me feel all claustrophobic and panicky and then I avoid her calls more and then she rings more etc etc. She's like a bottomless pit for reassurance - it's just not possible to fulfil her need.
So I need to find a way to lay down some boundaries with her so that she feels ok if I don't answer, and I feel less like I'm drowning under her need for reassurance! Any suggestions?