It sounds like your Mom may have issues. I would try to move out ASAP as is also sounds like your Mom may be part of the reason for your panic attacks. My mom was the same oh stop it, you'll live, your a hypochondriac, its for attention . I heard it all. You most likely can't change their perspective but you can accept that's how they are and dont expect them to change. Try to find someone you can lean on emotionally and who will support your needs.
If you've been dealing with this pretty much on your own from description of your parents you gave, I'm surprised you haven't already moved out.
I hope you and your parents aren't co-dependent .
Good luck and get out of there.
Terri