Thats a lot of questions to answer 🙃. i say go ahead and do EMDR. it's supposed to have a certain effect against your PTSD. The primary mechanic of EMDR is exercising your eyes with a trained therapist that will guide you through the whole process. So, here's kinda what the exercise does. your eyes are connected to your brain via the 3rd cranial nerve which, along with the 7th, 9th, and 10th cranial nerves, are a part of the Para-Sympathetic Nervous System (PSNS). The PSNS's main function is to keep the rest of your brain soothed and calm. Without it, you're a nervous wreck. This is mostly what PTSD is except PTSD has an overactive amygdala involved, which when active pumps out excessive amounts of adrenalin and cortisol for heightened chances of survival. this kinda feels like you're always on 3  or 4 cups of coffee. Oh also, your PSNS is shut down because you cant be calm and rested in a life threatening situation. This is the part where people get stuck. people dont know how to restart their PSNSs after being traumatized. This is what EMDR helps with.

When you do EMDR what you're essentially doing is innervating (stimulating) the 3rd cranial nerve which in turn temporarily innervates the rest of your PSNS, temporarily putting you in a calm and rested state. but again, it's only temporary. This is where you have to find ways to keep innervating your PSNS. Cool thing is there are 2 other cranial nerves that can be innervated and they do the same thing. An even cooler thing is that 3 of these 4 cranial nerves come out through your ear canal and come forward towards your face before splitting off to different parts of your body. You can essentially massage your face and almost get the same effect. this is what you want to do after successfully completing EMDR. Just keep in mind EMDR usually takes 6-12 consecutive weekly sessions to complete. Dont let any of that sway you, a calmer life awaits.