I did not know what dyslexia is until recently, and still don't have much knowledge about it. I did just a quick search about dyslexia and 難読症 (nandokushou, which is dyslexia in Japanese) on the internet.
As far as judging from what I've read, miki78, there's nothing to prevent you from learning Japanese!
I've read many of your posts on this forum, and you are communicating with many members well, there might be some misspelled words but it's not a big deal, people do understand what you are talking.
Language is nothing but a communication tool. I'm sure you can learn Japanese and use it to communicate with people just as you are doing in English language.
I don't think that dyslexia is the only reason to make learning a language difficult. Some people find Japanese very difficult learn, others find it rather easy. Some people learn it very quickly, some take a very long time.
So if you are interested in Japanese, and want to learn it, then go ahead!
Just take your time, go at your own pace, and enjoy learning Japanese!