You are so lucky to have the beautiful Grandy come by to welcome you here, a truly beautiful person 💕.
I can absolutely relate to your anxieties, and i don't really have any great solitions to be honest, but i know how terrifying the feelings can be, and sometimes just to knlw that you're not alone can help a little. I also am super creative with health anxiety and can concoct some pretty impressive stuff, depending on how stressed i am.
I can totally understand your reactions and worries about your brother, and the worries about your own health, especially with your experience losing your Dad. The fact that you have recently lost your job would just make the stress of everything that much worse, and extra googling time. You have had a lot going on and i am not surprised your anxiety has been triggered.
Feeling like you need to be "up" and happy around your brother as he approaches the time for his surgery will probably be putting a lot of strain on you as well. Are you able to talk through your worries with anyone, your husband or a friend? It can be a relief to let the steam off that pressure cooker of worries, and give you some breathing space, which you will need if you are to remain strong and supportive for your brother.
In the meantime, i hope you can hold yourself and all your worries with a whole lot of compassion ... acknowledge how hard and scary all of these issues are, and visualise giving yourself a big warm, gentle hug, knowing that you are dealing with these worries as best you can, including going for the mammogram today.
Let us know how you got on today if you feel up to it.
And know that you are not alone.
Thinking of you, and sending warm and caring vibes to you Brightbee.