Dental phobia is ruining my life

My phobia of the dentist is so bad that I haven’t been since I was 13 (now 28), I’ve had pain throughout the years and it obviously creates a lot of anxiety, however it’s never been excruciating. The last month or so pain has come on and off and I desperately want to get help. My boyfriend booked me in for a dentist appointment at the end of the month and the anxiety I’m having is actually ruining my life! I’m already on citalopram for my anxiety, but I’m really struggling with my mental health and I feel silly that it’s all coming from this phobia.

I know I need at least 2 teeth out and I honestly don’t know how I’m going to manage. I’m petrified even for the checkup 😢. It is genuinely making me feel suicidal and I feel so stupid. Please help and give advice in any way you can 😓😓 I’m from the UK btw