Hi. :) Well, the first thing I want to say is that I know how you feel, and I'm sorry you're going through this right now. It sounds to me like you have severe anxiety. The fact that it all started when Talia passed away is no coincidence. When you read symptoms online, they become rooted in your mind -- and are then manifested in your body. What I'm basically saying is that whatever you read about, you start to imagine you have. These symptoms are products of your mind -- not products of cancer. Sweating is a very common in people with anxiety -- and even in those without it. I wake up sweating from time to time. And as for the bruises -- I find them as well, in weird places for no apparent reason at all. It's usually just as simple as bumping the corner of a wall or door.
Don't worry -- you're not on the edge of death. You're okay and you need to start telling yourself that -- even if you don't believe it. You're in control of your mind, so replace all the negative thoughts with positive ones. And if you need someone to talk to, you can talk to me. :) Good luck, and I hope you feel better.