Good to read all these posts, totally understand where you are all coming from. I also started running after Christmas and did find that helped although once my husband changes his work pattern I couldn't keep it up due to childcare.
I also ask DH to hide my iPad sometimes so I can't sit and Google in the evenings.
I find reading a good book helps too.
I too have the cancer fear, lots of friends have had cancer and dh's best friend has recently died of it aged 49 so this has set me off again. I find it pathetic that I'm like this. This year alone I've diagnosed myself with bladder cancer, nasal cancer, eye cancer, salivary cancer and skin cancer 

. I have none of those things obvs but I start off with a totally small symptom, start googling and the next thing I'm digging my bloody grave. I too have to hide anything relating to cancer I see on social media, can't bear it. I went to the opticians for an eye test, they took an X-ray of the back of my eye, put it up on the screen and I went into a major panic because I thought the white blob on the screen was a tumour. I started sweating and getting palpitations......it was my fucking optic nerve
. Even I'm laughing now it sounds so ridiculous reading this back.
But I'm like it with everything, I made a mistake at work recently. In the grand scheme of things it was no biggie, cost the business about £200 but I made myself ill over it, even though I've saved them thousands this year. I googled and fucked about for a whole week, couldn't eat, sleep, function properly. When I told my boss she went mad at me.....for worrying! Said it was nothing, forget it!
Get me those pills! 