My T has specifically told me that he wouldn't look for me on here. I accidentally shared my username once while talking about something on the site (or maybe I printed something out? I forget). But he reassured me that he wouldn't go looking, which was enough for me. He's said he doesn't have time or the inclination in general to go looking up what clients might have said on a forum.

So I think you're likely OK to post. Maybe avoid anything very obviously identifying, change a detail or two maybe, if it makes you feel better (even if it's, for example, saying your session happened on Monday when it was actually today), and I think you should be fine.