My tip is to paste your review, or each section into a word document before submitting. This will show any errors in your spelling or grammar, and it's much cheaper than having someone look over your review for you. I know at one point I would pay my roommate $2 just to make sure I had no errors (and looking back I don't think she ever sat down and read them!).

Be sure to turn your auto-correct, spell check, and grammar check settings on or this wont work.

Auto-correct doesn't always correct everything, though, so it's a good idea to read over your review again before you submit it.

If you need some help brushing up on grammar, punctuation, or the other mechanics of writing, check out Purdue OWL.

Cherryredhead88 also did a pretty fantastic grammar workshop that I tend to point my students towards.

Pick up a copy of The Elements of Style. Keep it on your desk and grab it whenever you're uncertain about something. Get comfortable with it. Having a reliable guide will help with your review now, and will help more in the future as the rules of proper grammar slowly start to sink in.

Think about your intended audience when you write. Reviews on Eden tend to be casual, comfortable, and conversational. They aren't term papers, and they shouldn't feel like them for the writer or the reader.

Always read back over your work. Don't fall into the trap of thinking that editing is for people who aren't good enough the first time around. It's an invaluable tool.

If you're uncertain about something, read it aloud. It's easier to catch mistakes when you hear them.

Remember why it's important. Writing is about communication, and improper grammar makes it difficult for people to decode what you're trying to say.

You will make mistakes, and there will be things that you don't catch. Don't obsess over it.

If you find yourself making the same mistake continuously, make a mental note of it. It took time and effort for me to anchor the spelling of 'embarrassed' in my mind, or the correct definitions of 'bemused' and 'bespoke'. We all have our weaknesses. Recognizing them is the first step toward conquering them.

For people who feel like they have a solid hold on grammar, offer a helping hand. Remember as well that staying silent about a mistake helps no one.

All of the things I wanted to say were already mentioned! I agree with everything stated above, my only tip is to do more reading in general. What kind of grammar you have is based a lot on habit, what you're exposed to. If you grow up in a family that uses improper grammar, you will probably be the same unless you take the steps to change it. People tell me all the time I sound well-educated and I always giggle, thank them, and tell them that I'm not. I just come from a well-spoken family. So try to do more reading, whether it's reviews, articles, or just books that have nothing to do with EF. Exposing yourself to proper grammar will help develop better habits.

Also, writing your review, waiting a day, and then coming back to read it over again REALLY helps. Sometimes I totally miss things that could have been prevented this way. I should do this with all my reviews but I seem to only do it with the more expensive, more complex toys.

The Elements of Style is a great book.

I also have problems with words, due to migraine, similar to your epilepsy. I've been putting my reviews into Word files for a while, as it is easier to check the problems and fix them. I still end up editing after I submit things.