I just got mine a couple of months ago. At first I was worried when it would occasionally be brown, but that's totally normal.
And yeah my back was hurting too the first day I started in like January and I thought maybe I'm going to start but then I was like no way so I got home and I did... YIKES!!
Tips... well, I just started to use tampons and I have had it 3 or 4 (maybe 5) times. THEY ARE SO MUCH BETTER THAN PADS!! Lol
* cramps?. TAKE PAMPRIN!
Well I hope this helped (: