Hey, I can relate. Health anxiety can be so debilitating and I'm sorry to hear that you're going through this. As Dave says, googling is the worst thing someone with health anxiety can do, and if you can resist the urge to do this (no matter how strong it is), it will really help in time. Your symptoms definitely sound very typical of anxiety and lack of sleep will always increase negative thoughts.
My doctor told me that as a younger man, he thought he had a brain tumour. He was so convinced of this that he developed several very serious symptoms which left him unable to function. The mind can be so powerful.
Like you, my latest episode of health anxiety started when I had some unexplained symptoms. The symptoms got worse, I googled them, I developed new symptoms (that I'd read about), and I'm still experiencing a lot of anxiety over this....so horrible.
I really hope you're feeling calmer today and I hope that this helps in some way
Let us know how you're doing.
J