OP please read - with love and kindness from someone who previously suffered with severe health anxiety triggered by medical oversight of real problems, you are spiraling. I understand - I have been you so many times with similar issues.
The reality is, and I promise you this, you are a huge leap and jump away from there being anything to worry about from your overdue smear. Does that mean there is 0 chance of there being any kind of follow-up needed for something minor or major? No. However, it is incredibly unlikely (specifically for something that turns out to be major) and right now you are giving this 0.01% chance (making up the number but you get my point) 200% of your energy.
Your biggest issue by far just now is your anxiety. This is nothing to be ashamed of, but it's clear as day to everyone reading your messages that this should be your focus.
I now take an anti-anxiety medication and it has improved my life in ways that I can't even articulate. I can't believe now looking back that I lived my life the way I did and how much suffering I went through because of how my anxiety ruled my brain. I'm a successful professional with family and friends and interests, and I now actually enjoy all these parts of my life instead of just surviving through them terrified under the surface that I'm dying of something. (Full disclosure - I did turn out to have an autoimmune issue that had been overlooked so it wasn't at all "all in my head" like so many doctors told me, and this is now very well managed and doesn't affect me anymore).
I'm not necessarily suggesting medication is the right option for you, but I wanted to share my experience and to give you hope for the future that life doesn't have to be like this and hopefully some comfort in the meantime about the current situation.
On behalf of future you, I'm giving you a big hug just now. Please look up catastrophic thinking if you aren't already aware of it. Take yourself for a walk outside as well, if you're able.
Edit - I've just seen your update. I'm so happy you will get some relief in the short term, but this is going to happen again. Your brain will find something else to latch onto in die course. Please use this experience as a prompt to get help for your anxiety.