do you find that your health anxiety flares up when you aren't happy in another area of your life?
Yes, absolutely! Any hardships in my life makes my anxiety flare up. A really bad time for me is just around Christmas. I don't even know why really. My ex did die just before Christmas but before that my OCD always went into overdrive the two weeks before hand. I am really good at the moment but I know this is a time where I have to be very careful.
U2 can i ask, when you have a "flare up" (cant think of a better term sorry) do you recognise it easier?
Yeah, I can recognise it pretty quickly now. I came up with a wellness action plan with my therapist. I have written down the signs of an impending flare up and I have a list of things to do when it happens. Some physical things like walking a bit more, relaxing things like reading more and a reminder of specific CBT skills which really helped me. My thought chart being one of the main ones. I still might have some big panic attacks before I remember though, but i'm still pretty new to the recovery bit.
My husband is under strict instructions that if I can't recognise it ever he is to shove my plan under my nose 
I am in a really good place right now in life in general. I know that could change any moment. I just hope that if it does I have enough skills under my belt to never become so ill with it again. I
It does get better I promise. The work it took was hard, I would come out of CBT feeling even worse and so many times I wanted to give it up because I felt like crap. Then it just clicked.
There really is light at the end of this shit painful journey.