Oh dear. Oh dear, oh dear. I'm working a front desk job and I'm about to cry just reading about this.
I am so, SO sorry that you've had to endure this. And I'm so sorry this is the first response you're getting when you posted this a few months ago. I hope you see this message.
You need to get into a gynocologist ASAP. I don't know how the referral thing works--I thought you could just go in to see a gyno?--but if you have to have a doctor refer you, go and see every doctor you possibly can until someone refers you. This is ridiculous--you should have been referred a long time ago. Ugh.
I know how exhausting it is to seek out doctors. At some point you're sick of looking, and it's easier to "accept" that you're not going to find someone who can help.
Never believe that lie.
While you search for the right doctor to get you to the right OBGYN, can I make a recommendation? Get on Instagram. After my diagnosis, I was struggling with the loneliness that chronic illness brings. I got an Instagram account, searched for people with endometriosis, and suddenly BAM--I had an entire community of support at my fingertips! All of them were suffering the same thing I was, and I would have strangers DM me advice and support. It's been amazing.
There are good groups on Facebook, too. Find your community. You don't have to have an official diagnosis to do that.
Along those lines...don't be ashamed of your burn mark. Please, don't. We all have scars. This hot water bottle thing is actually a pretty big problem in the endo community; one girl on my Instagram posted a picture of her stomach, completely covered in red from years of burn scars. A lot of endo people have fought drug addictions because of the temporary pain relief they bring. If you do what I did with Instagram, and admitted it to your new community, I can guarantee you, you will receive so. Much. Support.
Also, you can send me a message with any questions you have. I would be honored to answer them and help you as you seek out relief. DO NOT GIVE UP. You can make it through this. You will find relief.
I'm praying for you. xoxo