littles,
3200 mg of Asacol - wow, that's alot! Are you able to tolerate that much without any complications?
I think your knee pain could be Reactive Arthritis, but generally this affects several joints, not just one.
Mine affects my neck, down my whole back, then in my hips, lower back, knees, ankles, and then every joint in the foot, and the bones in my legs too :(
The pain is especially bad at night, and as a result, even with sleeping pills, I cannot get more than 4-5 hours of sleep (and I am one who needs a good 9 hours to feel human!).
With regard to your recent and ongoing flare, I would suggest a few things you might consider. I got very sick on the mesalamine pills, but found I could tolerate the Canasa suppositories.
I would recommend, besides the SCD diet, Slippery Bark Powder (not in pill form, the most effective form is powdered) taken a few times a day - this is nature's mesalamine: it coats the whole digestive tract.
Also, as a probiotic: VSL#3, it's got 450 billion active cultures and is made especially for those with Ulcerative Colitis.
Off course, stay off all dairy - though you could have Almond Milk.
And lastly, I would suggest to get yourself on transdermal LDN (here's the thread to a prior post I made on it:
https://www.healingwell.com/community/default.aspx?f=38&m=2079694
Keep us in the loop as to how you're doing.