I personally think it is unlikely that you can control your symptoms by avoiding bad foods and eating good foods though there is a thread a month or two back detailing some positive results from spinach and sunflower seeds. Search "spinach" and you should find it.
I was like you, very physically active with an aversion to pills who had a habit of enduring and ignoring every ailment I suffered until it went away. When I got UC, I didn't change my ways and just like you went off colitis medication for a long time and endured and ignored the symptoms hoping they would go away for good. Six months ago when I was in the hospital a young GI doc stood by my bed, patted my leg and said to me, "You do realize that you will have IBD for the rest of your life, don't you?" The truth was that I did not believe I would, but I do believe now. I hope you know this too. It may also be the case that you will have medication every day for this disease for years, or for the rest of your life.
I agree with everyone who wrote you that you should seek medical advice. I bet a good doc, when you explained your travelling, would be willing to treat you long distance through phone and email. You can have a blood test in any old place and fax results to doc. Don't delay. You shouldn't have to suffer needlessly. When you get your energy back it will feel better than anything else and you will never take it for granted again.
UC diagnosed 10/05, first symptoms 1983
asacol daily and rowasa as needed
Trying out Digestive Fitness Probiotic
past rx: colozal, lialda, canasa