Hello! I am more than happy to help you with advice! I am in the same boat as you when it comes to dental anxiety... at least I used to be! I neglected my teeth as a child and a lot as an adult as well. So, your dentist saw the photos and said your teeth look pretty good. That's good sign number one. If your dentist says they look good, then they probably are!
Tartar removal typically does not hurt. Do you have sensitivity in your teeth or gums? Do you know?
First, let's talk about the X-rays. They're no big deal. Some of the angles they put the film device in your mouth are weird and awkward but not painful. If you have a strong gag reflex, do this... Lift your feet up off the chair, point your toes forward, and flex your abdominal muscles. This will help control the gag reflex.
Now, as far as what the Xrays will find, they might find something. I'm not going to beat around the bush here... You won't know until tomorrow. But I recommend looking at it this way, you have what you have and now you need to focus on getting it fixed. The sooner it gets fixed, the fewer problems will arise later. It's good you are going to get this done tomorrow. Don't worry about what you might have, let the dentist find out and then talk to you about it. Until then, take some deep breaths. As far as the grinding teeth, get yourself a mouthguard from your local Walgreens. It will help with that.
I must also mention that if they do find something more serious with the X-rays, they might make another appointment to take care of it. So you can most likely relax with that.
After X-rays, they will most likely do something called Perio-charting. It's basically a small little measuring tool they use to measure the pocket depth. Ask for topical numbing jelly before they measure if they do say they're gonna do that. If they do the measuring, it's not bad. You will feel some pressure, maybe a little bit of poking but I promise nothing tear-inducing. The numbers you want to hear are 1-3s. They will give three numbers per tooth. The dentist will say something like Three two three. four three four... something along those lines. If you hear anything more than a 4, let us know. We can talk more about that if that comes up.
Here's what to do today, whenever you feel anxious, just breathe. Do the square breathing method. Take a deep breath in for five seconds, hold it for 5 and then out for 5, then hold for 5. Tonight, to help you sleep, work on flexing and tensing your muscles, each one from the top of your head to the tips of your toes. Flex them each for five seconds and then release the tension. With each release, focus on that muscle relaxing. This is how guys in the US Army fall asleep within minutes. Breathe throughout the process. As you breathe in, take in all the worries and stress of the day, then as you breathe out, feel that tension melting out of you into the bed and away from your body.
In the morning, before the appointment, focus on breathing deeply. Really deeply. Put on your most comfortable clothes, get to the office early and use the bathroom. Then focus on breathing. Know that the dentist is skilled and has your comfort in mind. He knows what he is doing.
I'm proud of you that you are confronting this now and not waiting till later. After the appointment, you can eat almost right away except for any sugary treats or hot things. Wait 30min to an hour for that stuff. Get yourself to the store and buy a toothpaste called Perodontax. It will help control any bleeding. I also recommend Oral B Proglide floss (grey package), an Oral B electric toothbrush and a waterpik flosser. Those can greatly help. Any other questions, feel free to reply or direct message me. Good luck and remember to BREATHE! That's the most important thing.