I totally sympathies - I have had six months of terrible HA and full blown panic attacks. I then developed stomach aches and bladder problems which made me convinced I had either bowel or ovarian cancer. Before that it was fear of losing my teeth, before that it was heart attack/stroke. I felt I was trapped in my mind and falling down a big pit of fear and despair. Couldn't bear to read/watch anything about health issues and was constantly googling random symptoms.
The thing that helped me the most was keeping busy and being with people. Not easy in your situation I appreciate, but don't be proud, seek out anybody/any place where you feel you might be able to relax a bit and forget yourself. You also need to be kind to yourself - I hadn't realised how tough my last two years had been on my mental wellbeing and once I gave myself a break, I felt a bit calmer.
Mindfulness and meditation helps - look up your nearest Buddhist centre, they will run courses and at the very least you will meet caring people and others who are going through the same as you [it is very common].
I don't know what made me feel better recently but it happened all of a sudden and I am trying hard to stick with the moment. Good luck, it isn't easy but tell yourself 'this can't last forever, I will get better'. You conquered it before, and you can do again.