Oh there have been times I could have written your post & that's without the trauma you've been through the last couple of years.
OP - propranolol may not be the right thing for you. There's a certain amount of trial & error with these kinds of meds. You said you've been on it a week or so, if it's not right for you then it will make you feel worse for sure. Perhaps something like sertraline would be better. But the person to tell you that is your GP.
If we assume you aren't dying (which you're really probably not) then it's important to understand just how serious the effects of health anxiety/anxiety are. Or how serious they feel. It can effect every part of your body. Cause every type of pain. As you look up each type of pain & link it to a particular illness, the other symptoms of that illness get stored in your brain & you can be damn sure they'll manifest themselves at some point. And they will feel real! It's real pain & discomfort. And it just uses you to feed itself - It's hungry af & you looking up each thing trying to piece the puzzle of what you're dying from is food to it.
But you can't stop looking cos you might miss that symptom that proves you're dying!!
Understanding this helps to get it under control a little bit, but you do need help with the right meds.
It's also worth remembering that if you're anaemic (you don't say what your results were) it will make all these things worse. If you're peri? Add another level of worse.
Go back to your GP - ask for something else to help you. Propranolol might prevent the physical symptoms but you need something to help your brain - and that's fine!
If you are going to Google (and you are) then use this tip. Add 'mumsnet' to your search term every time. Remember - cancer & terminal illnesses are actually rare but the symptoms are often common & not linked to anything serious at all. Reading threads from other ppl who've experienced these things you'll see how many others are very much alive.
If it helps - I ended up in A&E, my body crumpled, & shaking uncontrollably, my hands clawed & stiff, feeling like I'd be unconscious any second. On the way there I was terrified, absolutely convinced I would die before we arrived - I couldn't speak for fear. After a few minutes of sitting with the Dr he quietly pointed out I was breathing better, my posture was returning - cos it was a panic attack. Me focusing on him pulled me out enough I could realise what was happening.
In short - yes, anxiety & mental illness can absolutely do this to you body. Don't underestimate what you've been through - it's not ok & it's ok for YOU not to be OK as a result.