Just spotted this thread... I myself went through a period of having reasonably bad health anxiety
(hypochondria) which manifested as part of some GAD I was experiencing.
One of the things which exacerbated my health anxiety was that the anxiety would cause any number of strange symptoms to pop up. You seem to talk about different physical symptoms appearing... there really is a very long list of symptoms that anxiety can cause which can mimic other health concerns. For example, I thought I was developing diabetes for a while because I was always going to the toilet overnight, I was more thirsty & I occasionally had some itching. What it all came down to though was I was drinking more because anxiety was giving me a dry mouth, hence the apparent diabetes symptoms. I think the itching was mostly in my head too. I also was concerned about having heart problems because my heart rate would often be up around 80-90 even when I was sitting down & I was aware of my heart thudding away. That again was just anxiety though.
What was particularly helpful for me was a combination of SSRIs & talk therapy. I completely understand that you have tried SSRIs & they aren't effective for you but I wouldn't give up. Perhaps having some benzos as PRN could be helpful although I would be wary of becoming reliant on them as addiction is always a risk. Also you could try Buspar... it deals with the physical sensations of anxiety which if they are a trigger for your health anxiety could be a help.
As for therapy I can't stress the difference it can make enough. I never did any CBT as such but I believe the worksheets I got to look through were based on CBT. Some of the more useful things I would remind myself of every time I started worrying about my health were:
- "My life has been full of terrible misfortunes most of which never happened.", Montaigne.
I find this quote to be of particular use. It demonstrates that most of what you are worrying about will never happen. In terms of having various health problems it helps to realise that the chances of you having serious illnesses are very remote. Sit down and really think hard about how many of your health concerns have turned out to be true - I reckon very few times.
- Emotional Reasoning (Cognitive Thinking Error) - I feel bad so it must be bad. I feel anxious so I must be in danger. Just because it feels bad doesn't necessarily mean it is bad. My feelings are just a reaction to my thoughts - and thoughts are just automatic brain reflexes.
Again this is really helpful if you repeat it to yourself every time you start worrying about your health particularly if you are getting physical sensations. When you are getting worrying thoughts over symptoms, whether real or imagined just remember that just because you feel something is wrong doesn't mean it is... it's just a natural response to what you are feeling or seeing wrong.
There was more I got, I was looking for the worksheet I got on health anxiety but I appear to have misplaced it. Regardless try using those two things to help you see reason nest time you start worrying. I'm not saying they will instantly quell your fears but if used regularly, they can help change the way you think.
Also I find it really helps to understand what health anxiety entails. Realise that it will make the smallest thing into a major concern. It makes you hyperaware. It also helps to stop looking things up. I know all to well that it is tempting to Google symptoms every time they appear but that is counter-productive as it will just make things worse. It just starts a vicious cycle of seeing things wrong then validating that with different diagnoses. If you can break that cycle then you are a long way to making some real changes.
It takes real effort to make these changes in how you think but it really is possible especially with therapy. I'd seriously think about seeing if you can get either some talk therapy or CBT.
Good luck!