@elisheva please don't be ashamed, there are so many people in the same position, and many dentists love a bit of a challenge rather than an uneventful check-up (it would be a bit pointless to go through years and years of training and then not be able to use your skills, right?). A lot of dentists get their biggest satisfaction from making a real difference to people's lives, getting them out of pain and boosting their self-esteem.
I'm not sure if you've seen the information pages on our website, but there are lots of tips that might be useful.
1. In terms of actually searching for a dentist, we've compiled some great tips here:
Discover how to find a dentist who is good with nervous, scared or phobic patients - and who to avoid!
www.dentalfearcentral.org
Truth be told, that page could do with a bit of an update - it was written before AI started to become more powerful, so nowadays for a selection of potential dentists I'd probably also use Gemini. Having said that, personal recommendations are often best, but I understand that might be a no-go if you're too embarrassed to talk about this. Do you have anyone you can confide in at all?
2. Regarding DIY pain relief tips, this page may be of use:
Useful tips for dental emergencies and DIY dentistry, including pain relief for toothache, temporary fillings and how to put crowns back on.
www.dentalfearcentral.org
3. For preventing future problems or to stop things from getting much worse, you could have a read of these pages:
Find out how to prevent tooth decay and how to stop existing decay from getting worse.
www.dentalfearcentral.org
Is flossing is pointless? How do you best look after your gums? Find out how to prevent gum disease or stop it from getting worse!
www.dentalfearcentral.org
There may be other pages that are relevant, depending on your situation (for example, some people grind their teeth or you may have problems with sensitive teeth). It can be a little difficult to navigate the website on a mobile device so if you can, it would be best to use a laptop or desktop so you're able to see the sidebars.
This is probably all a bit overwhelming right now, but if you feel able to, see if you can dip your toes into some of those pages

.
I don't know if you have considered enlisting the help of a psychologist to help you through this, but that would be worth thinking about as well.