Judging from my own stats and what I've read, 7 is in the normal range of a winning player. Anyone can go through a rough patch. I think it also depends on how many games you have played. If your sample size is 1000 tournaments, I think a losing streak of 7 would be very usual, but probably on the high side if you only have 100 or so.
Honestly, I think the only real relevance to "in a row" is to see if the cause was going on tilt which you've already admitted to. I've read that 300 tournaments is enough to have a good read on your ROI. Don't like at it after a losing streak or a winning streak, just where its generally been.
Hope thats helpful.
Kev