You mentioned that you've read through the other thread, and I'm pretty sure in that thread both KWalker and myself mentioned the ill effects we experienced when we took too much psyllium at once. I doubled my dose one day and I believe KW did at one point as well. I recall he said he was feeling like he was partially obstructed, with a lot of abdominal pain. I had some abdo pains as well and felt extremely bloated and just plain uncomfortable. So, learn from our fail - do not take too much psyllium at once! As Dusty said, start with a teaspoon or so and sloooowly work your way up from there if that doesn't seem like enough. I had slowly moved up from a teaspoon to a tablespoon over time, and that was about the right dosage for me. My package of psyllium says to take 2 tablespoons per day, but that amount would put me in a world of pain and bloat.
My other advice to you would be to only mix it into cold water. I tried mixing mine into hot tea once, but it turned into a weird solid globby mass. I've found similar results mixing psyllium into food, it just turns everything sort of globby and gives food a weird thick gooey texture. Oh, and give psyllium a few weeks to fully kick in - you might have some mild cramps the first few weeks, but after that the cramps should stop once your body is used to psyllium. (That was my experience anyway.) And yes, as Dusty said, no meds within a couple hours before or after taking psyllium as it can affect how certain meds are absorbed. Good luck with it!