THREE of your statements stick out like red flags to me:
1. actually I really never had sciatia, just mainly ITBand. Like my leg never gave out or anything, I think I had SI joint issues, maybe I still do, but now I can do 6-8mile runs at least. I think the sciatic thing was mainly in my head and if anything maybe a LITTLE bit just from a very spasm'd piriformis
2. had some ITB pain with very tight quad, and then all my butt muscles went into spasm in the next couple days without me running, leading me to believe it was a SI joint problem. I also developed very bad lower back pain on that side
3. The main problem has been when I start running again my hip/glutes/itband get tight REALLY fast and then bad things start happening.
I find the 3rd statement to be the most concerning. I am not doubting the pain in your ankle. It may or may not be peroneal tendonitis. But I will tell you flat out right now, it is not what you should be concerned about, at least not in my opinion. I am basing my advice off a lot of research, personal experience, and experience with other serious runners and people who compete in sports with a lot of running involved. Something else is wrong and it has to do with your muscles tightness and dysfunction between your lower back and glutes.
Your hips and glutes and it-band should NOT be getting tighter as you run unless something is WRONG and they are trying to protect you from further damage. It doesn't have to hurt to be serious. I really STRONGLY recommend you go and see an orthopedic, but make sure you research them before you go to see them. You want to make sure they are knowledgeable with lowerback and hips - ESPECIALLY hips. I think you are putting unknown force on your lower joints (i.e. your ankle) because your stride is not natural and healthy do to chronic tightness and muscle dysfunction above.
Now, here is the part where you are going to want to naturally argue a bit (and I don't blame you, becuase you want to run). "I have been doing 'x,y,and z' for therapy and strength and my symptoms are getting better and now I can "run" for 6-8 miles.
Let me ask you the following:
How does this "running" compare to before the injury?
If you try to run at a faster pace does it bring on your symptoms? Is it really FUNCTIONAL running or are you constantly having to pay careful attention to your stride and mechanics and pain and symptoms? Do you feel discomfort during and especially AFTER you run more often than not??
I think you know what the answer to these questions should be if you are truly getting better.
I also think something is wrong besides your ankle because this has been going on for months. It's chronic. If it was just your ankle I don't think this would be the case.
Can I ask you a few more questions?
Besides pain in your itial tuberosity (sit bone), do you have any discomfort in EITHER of your hips or your glute or lower back when you are sitting for long periods of time?
Do either of your hips ever make a popping or clicking/catching noise, EVER? It might only be once a day, or a few times a week.
If you can answere these questions for me I can help narrow down what type of doctor you should look for and specifically what type of injury you may want to suggest they test you for. I already have one in mind but I want to make sure before I jump to conclusions.