late30's, In the general scheme of things, we are asked to keep to one thread until that thread reaches 100 postings and then begin a new one. Subject lines can be changed within your threads as your thread progresses. The reason that we are asked to keep to one thread is so that we can follow your progress, just as you do.
BTW, here's a link to a thread that I had back a long time ago called "In Tandem--MLC and Depression". We could have spinoff from that thread or included it in a new one on depression.