I sometimes experience heart palpitations but I've never tied them in with my anxiety. Something new to think about!
What has helped me recently with the palpitations has been kundalini yoga. It's basically controlled breathing with some movement and yoga poses. I use the DVD 'Kundalini Yoga to Detox & Destress with Maya Fiennes'; it's a bit new agey and lovely. Generally, it might help you to take a few minutes and practice some breathing techniques. Just sitting down in a quiet place and breathing deeply through the nose helps a lot. It's what I used to do before the yoga. I found it very relaxing and would help quiet my heart.
Good luck with your family. I hope things improve for you!