My Brain Knows the Right Answer, So Why Do I Keep Saying the Wrong One?

I've always had trouble with left and right. If someone tells me to go left, there's a good chance I'll initially think right. Over the years I've developed ways to deal with it. I usually have to stop, think about it, and consciously remind myself which direction I'm supposed to choose. That works well enough that I'm probably right about 99% of the time, but it takes effort. Three years ago, I was in a car accident and had whiplash and a concussion. For several days afterward, I noticed something that was different from my normal issues. I knew what I wanted to say, but I had trouble getting the words out. Thankfully, that problem passed after a few days. I still notice some odd things with language and information processing, though. I've always mixed up three-letter abbreviations. CSM can become CMS, and IoT can turn into ITo. I'll say the abbreviation incorrectly without realizing it, and then sometimes immediately afterward I'll think, “Wait, that's not right.” I've had that problem since before the accident, so I don't think it's something I can blame on the concussion. The newer problem is with two-digit numbers. I'll read 57 correctly, but when I go to think about it or say it, I'll sometimes say 75 instead. What's strange is that I usually realize almost immediately that I've switched them. I'll have to try again, sometimes two or three times, before I get the number right. I don't have trouble reading or writing. If I look at 57 on a page, I know it's 57. The problem seems to happen when I'm trying to produce the information myself. I'm not saying I have aphasia because of this. I know aphasia is a neurological language disorder and that there are several different ways it can affect communication. I'm trying to understand where these kinds of mistakes fit, especially since some of them existed before my accident and some seem to have appeared afterward. Has anyone here experienced something similar after a concussion, stroke, or other brain injury? I'm particularly interested in people who know the information is correct but somehow produce it incorrectly. Maybe you switch two numbers, rearrange letters, say the wrong word, or give the wrong direction even though you know which one you meant. The weirdest part for me is realizing the mistake almost immediately. It's like my brain knows the right answer, but the wrong one gets there first. I'd be interested to hear whether anyone else experiences this and whether you've ever had it evaluated by a neurologist or speech-language pathologist.