Welcome to the Healing Well anxiety forum, I'm happy you found us but sorry to hear you are suffering from Health Anxiety. This is an awesome community that cares and above all else understands what it is like to live with anxiety, so stick around and we will walk this journey with you if you'd like us too.
As Hibee said, alot can be done for HA such as CBT therapy, so I recommend you seeing a therapist to start some CBT. Have you ever been in therapy for your anxiety before? It really does help.
I also agree with Hibee that you need to trust your test results and start believing that you are fine, I know that is hard to do, but you've had a ton of test and they all came back normal, the chances of you having a stroke or cancer at your age are very slim.
Here are some links for HA taken from our resources, please look at the resources thread for more helpful links.
Health Anxiety - A Self Help Guide:
www.nhs.uk/conditions/hypochondria/pages/introduction.aspx Helping health Anxiety
www.cci.health.wa.gov.au/resources/infopax.cfm?Info_id=53 Health Anxiety- The Super Scanner
www.get.gg/docs/SuperScanner.pdf