TL;DR I am going to see a psychiatrist about possibly starting antidepressants but am afraid that they will be ineffective at treating specific health anxiety 

I have been struggling with horrendous health anxiety for the last few months and it's starting to take a toll on me. One year ago, I was diagnosed with a health condition that isn't life-threatening but causes me to feel unpleasant symptoms such as tachycardia, dizziness, shortness of breath, passing out, chest pain and more. Since then I've dealt with an increase in health anxiety to the point that I can't function. I can't work, I can't leave the house, the smallest sensation in my body will send my thoughts racing thinking of a thousand ways I could die imminently. I've convinced myself I'm having a heart attack or stroke more times than I can count, and I recently landed myself in the psych ward having an extended panic attack and uncontrollable feelings of doom, convinced that I was going to die despite doctors telling me I was fine. 

I have an appointment with a new psychiatrist in a couple of days to develop a long-term plan and I'm just terrified that they won't be able to help me or that antidepressants will be unable to target the specific anxiety I have about dying of some horrible health event. I truly can't live like this anymore and I'm worried that nothing will fix the problem I have. Has anyone with health anxiety had a positive experience with antidepressants? I just really need some reassurance or to see light at the end of the tunnel.  

I'm also doing dialectical behavioral therapy as part of my outpatient treatment, which I am keeping my fingers crossed that it will help alleviate the anxiety as well.