For what it's worth, I don't think that a 16 trade losing streak is truly significant in the grand scheme of things.
Remember, trading is a long game. No time limit. No sudden death or extra innings. It is endless. In this neverending "game" anything can and will happen. So, even if it is just "bad luck"....coming up with 16 tails in a row on a coin flip, whatever, it should not be given more significance than it deserves. Especially since, as you say, you are still positive overall.
Also, as a "swing trader" in what sequence were the trades done? What relationship, if any, was there between the trades?
A scalper makes 16 quick trades either in quick succession or even one trade a month for 16 months, and loses in all of them; well you would have to say this is an aberration and it is less likely to happen than 16 consecutive winners (basing this on there being some degree of planning involved in each trade).
A swing trader who puts on positions that overlap and have a relationship to each other is more likely to see the positions go against or in favor of him or her. Even if the trades are both long and short. I can't begin to count the times as an overnighter that I lost on both sides going home mixed. So often do reversals occur simultaneously on both sides, that I have essentially stopped overnighting, because of exactly this. It is now easier for me to come in fresh each day and initiate trades rather than hope for the follow through that worked so well for so many years. There is no doubt that this has been an extremely difficult trading environment for a long time. Too long!
Bottom line to me would be that the 16 consecutive trades, especially for an overall successful trader is just one of those things that you chalk up to experience (albeit a bad one). I was in a casino waiting to see Eric Burden a few years ago. I went to a $2 blackjack table with $35 in chips. Bet two dollars a hand with the intention of pressing 2, 4, 6, 10 (as was my "custom"). I did not pick up a single bet. So my only bets were $2. So, excluding a few pushed hands, I lost 17 straight. Had a dollar to give to the cocktail waitress

It happens. (Eric Burden was great...at Arizona Charlies in Vegas.....very cool. Small "bar" show).
I would not get discouraged. I always tell my guys to just cut down on size when you hit a bad streak. I myself always do. I don't trade huge size, but I have cut myself back 90%+ many times. I have seen guys that normally trade 20k share positions (and more) cut back to 100 shares to ride out the cold streaks. I have never had the ability to carry 20k share positions, but I have cut from 8k to 100. But more significantly, the buying power I use has been often less than 5% or so of what is available to me. I think that cutting back keeps you in the game and ready to accelerate when it turns for you. Cutting back to zero doesn't do anything other than give you a rest. Which is good, but shouldn't turn into an extended vacation. Don't want to lose your "feel".
Hang in there!
Peace,

rs7