Hi Somer1982,
sorry to hear about your situation. Reading your post the question for me wouldn't be about the specific kind of sedation you should use but about dealing with your dental anxiety in general.
While sedation is a good option to make you deal with treatment, it's something that only works once and short term and will have no effect on your overall dental anxiety (if there is no positive memory of a treatment then your brain cannot learn that a treatment is ok - it will only learn that sedation is ok). You will need to see a dentist regularly (everyone does) even after all your fillings are done so it's not about how to get over it once but about how to make you able to deal with treatment and with dental visits in general.
Even with sedation on your side, you still will have to be able to call your practice and make an appointment, be able to get there for your appointment and after the procedure is done, it anything doesn't feel right in your mouth, you should have enough confidence to get back to your dentist and have it looked at. You can get sedated for big things and it is a help but you will still need a practice that makes you feel welcomed, comfortable and confident to come back.
So no matter if you want to get sedated or not, the first step is to find a dentist that makes you feel accepted and is able to deal with you. There are a lot of practices that are willing to chat to you via email or phone to get to know you and also that offer an appointment only for a chat for you to get to know them and the environment. It might be a good idea to do this first so that they can put you at ease and build some trust. If this goes well, you might want to make an appointment for an exam. While I understand that you do not have much time now and need treatment, smaller steps are the best way to beat dental anxiety. Every time you have made a good experience in a dental practice, your fear gets a bit less. I can only encourage you to look up practices and find one you feel might be good and be able to deal with you.
There is no way around a good dentist, there really isn't. You certainly would manage to get through a treatment with sedation even with a dentist you do not feel comfortable with, but is it worth it if it makes you avoid any further dental visits and in few years you are back to square one?
Here is a link to the 'what can help' section here on the site. It might help you to get a picture about the different approaches when it comes to dealing with dental phobia:
https://www.dentalfearcentral.org/help/
All the best wishes, keep us posted and hopefully you find a good way to get your treatment soon.