Whiskey, but not too much. One glass ends the losses. Two brings 'em back.
Breaking a Losing Streak
After a streak of good results I have had similar losings streaks. There could be many explanations for this of course, but one possibility could be poor concentration / attention resulting from the belief that once you are already so much stronger than before (rating-wise), you can afford to relax a bit and go with the intuition. "Why concentrate, I just gained so many rating points that winning this 100 point lower opponent should be easy now?" In these situations for me it has not been helpful to just stubbornly keep on playing without changing anything.
Some suggestions:
-take a break from chess (one day, a couple of days, even a week). Especially if you are getting frustrated or angry on your temporarily low performance. Then it is really pointless to play. Get back when you have regained your composure and can think with a clear head. If you want you could still do tactic exercises etc in the meanwhile, but keeping a break from playing every now and can be helpful, giving the brain a rest every once in a while.
-analyze your losses to find mistake patterns and try to focus on those things in the future
-try to always concentrate 100%, stay alert at all times, have an active plan and also always consider, what your opponent is trying to do, regardless of your rating, the opponent's rating, or any recent gain of strength you may have had. Always respect your opponent!
-I also noticed your winning streak consisted on losing mostly to players rated higher than yourself. I wouldn't be too worried about that. A lost game is often a good lesson anyways.
After a great run of over 1/2 a dozen wins I have been on one heck of a losing streak. Anyone have some helpful advise on breaking a long run of loses