DMs health anxiety and it's impact on me as her DD

[HSKNT]

NC but have been here a fair while

My DM has anxiety. Previously diagnosed about 20 years ago. Never had talking therapy. Has never and will never try drugs.

I am mid 30s, married, haven't lived at home for at least a decade, very independent etc

Myself & DH have 2 DDs
DD1 epileptic
DD2 breathing issues- not asthma. Think congenital birth defect. Which is exasperated by colds, coughs etc.

DH often works away. I have stopped telling my DM when he works away as she will call/text/randomly turn up to check "we are ok" She will then over the phone or face to face pour all her anxieties about me being alone with both DDs if something was to "happen"

DM has just left after such incident; telling me she's so worried. I must text whenever I wake with girls (3 & 1 year old)

Now before she arrived and off loaded I was fine. Now I'm sitting here convincing myself that the colds they both have (DD1 had a little seizure last night and DD2 does sound binged up etc) are going to result in a trip to hospital! Historically they've both been blue lighted in. DD1 before epilepsy diagnosis and DD2 has had a few incidents where they've rushed her in thinking sepsis/or sats were low.

I am not an anxious person by nature. I'm pretty relaxed about the girls and their conditions.

So after that mammoth explanation- AIBU to tell my Mum to not cry to me about these anxieties or am I being a heartless bitch? It makes me feel like a shit mother and that I should be more concerned? Am I too blasé?

Jeeeeez that was long! Apologies to anyone who gets to the end

I think you need to sit down with your DM and explain that her anxiety rubs off on you and it’s totally unhelpful.
Discuss boundaries with her - how much (if any!) of her fretting and flapping are you prepared to listen to, and how much is unacceptable. How often can she come to your house, and should she wait to be invited.
Draw her some definite lines and tell her you need these to maintain your own mental health. And try again to get her to see her GP about her anxiety - this is much more appropriate than her offloading it all on you.