You were unlucky to have that cyst, but it was lucky they found it then. My son had a friend who started college and within a week was in hospital for the same thing but with complications, and it took her a good year + to recover.
I'm happy for you that you found the Blood type diet.
I admire your tenacity, and strength of character that you kept looking for answers. My health issues were milder when I was young, but I can relate to some of what you describe.
The sinus drip and the mucus I can relate to, I spent years gargling with salt water thinking I had a cold coming on often. Also suffered with sluggish bowels. Once I discovered gluten/dairy sensitivities and took them and sugar out of my diet I had a big improvement. And with the Blood Type/Swami diet it just keeps getting better.