you surely would not be the first. chopin is very difficult. so much chromaticism. i think sometimes everyone has a bad day. it could have been your bad day.but, also - if a certain fingering is not working well - you might find another to be more 'reassurring.' i've found for certain pieces - if there is a repetition that is not played with similar fingering - it really messes me up (unless it is a forced repetition with certain fingering that cannot be changed). but, i really try to figure out as similar of repetition fingerings as i can. also, there is much you can do to aleviate things by taking some notes with the left hand at times. this frees up the other hand and creates a less stressful scenario.with this piece, in certain places you can use the 'drag' method. what i mean is drag the same finger down off a black note to a white note. for instance in my book i have fingering written which doesn't use this - so i x it out.i wrote in (going up) 421, 5,5,4,3,4,5,5,421,5,5,4,4,5,5,4,3,4,5,5,5...now going down you might be using the 3rd finger more - ie 5, 4, 3, 3, 421, 4,5,4,3, 421, 3, 5, 5, 4, 4, 3,3... so you drag the pinky at the end of the line from B natural to A with 5, then G# to G with 4, and F# to F with 3.
It may be a memory or concentration problem. Don't feel bad, this happens to most people and we can all learn from our experiences. From my readings on memorization: When we memorize, we may be ingraining details into our heads that we are probably unaware. For example: the texture of the keys, the height of the bench, the angle and intensity of light, the temperature of the room, the finish of the piano, the reflections off the fallboard, etc. When we do our slow and methodical practice we, also are taking in the environment and particular piano we practice on. When we perform, it usually isn't on our practice piano or room. Yes we know the notes very well, but especially in newer piece we are also sensitive to environmental changes because our brains are still in the process of committing the music to memory and being able to recall and playback from memory.So when it comes time to perform, a different piano can cause our brains to go a bit astray because during practice the piano and environment have been a constant and now we have changed some variables and memory playback may be a bit confused. Our brains have to adjust. That is why it is good to practice playing a new piece on different pianos and atmospheres. This may be a case of memorizing too much (as in the feel of our practice piano). We have to learn to be flexible in our performing, so we retain the details of the music yet adapt to any particular performance environment.Hope that made some sense.
The only problem I have qith fingering is in the double octaves in the measure before the last one. I use the fourth and the fifth finger together cause my teacher told me to do so. I read on a topic here that some people think it's good. I think it makes the octaves much more energic, but it is practically sure that I'll put wrong notes in the middle... also cause my hands are really not so big (the larger interval I can reach is only a nineth). Maybe I just should use the fifth?