First, I greatly appreciate any willingness to help me out. There are 3 things I feel that can be mentioned in the additional info, but I’m not sure if they’re really appropriate.
- So, throughout the application process, my dad has been particularly controlling over my essays, thus causing me to lose some of my voice for my MIT essays. He has this undying desire to continually edit and polish my essays. I've reasoned as far as I could; I've spilled some tears; I've pleaded, but he has not relented. The worst part is that I know he's trying to help, but I can't seem to make it clear that the best way is to just give feedback, not edit.
- I have a rare eye disease that I was diagnosed with at 9. Long story short, the issue causes red eyes and lots of pain when a dust particle gets between my contact and eye, frequently causing people to be suspicious of me smoking you-know-what and forcing me to leave home early on school days due to unbearable pain and the fact that I need a special plunger and cleaning liquids to store the removed contact lens. (sorry, long sentence) I considered writing my "challenge" essay on this, but I had another funnier occasion that made more sense.
- Research! I took up a research internship during one summer. Unfortunately, my professor didn't have the resources to continue my research, and the research hasn't been published, although I do have a supplemental rec. I couldn't continue the research myself because the lab was in downtown and, well, I'm not near downtown.
So, should I mention any of these? If so, how should they be presented?
Thanks very much!
Unfortunately, I don’t think anyone understands your situation well enough to answer this question other than you. If you think this information is important to you and it will help the committee make a more accurate decision, go for it. Again, It’s up to your best judgement. Good luck. 
im not an expert like everyone else here, so my advice may not be the best to take, but personally I wouldn’t mention 1 at all, complaining about your parents in a college app isn’t the best look, in my humble opinion. I would DEFINITELY mention 3, and as for 2, my question is, what would mentioning it add to your application? There’s a fine line between saying “I’ve overcome a challenge” and “feel bad for me”, which is why I feel 2 would make a great challenge essay, but I honestly can’t tell you if you should mention it in the additional sections comment. I wrote about something similar for my MIT challenge essay and got in during the EA round (cAnt wait to go in the fall, if I can afford it!!!). However, in other applications, I’m not mentioning it at all, cuz it’s not really relevant and it feels like it’d be just complaining. It was only really relevant, for me, to write about in my challenge essay. so if it were me, writing it as a challenge essay may be a better route to take.but I honestly couldn’t tell you, if you should mention it in additional info. cuz I’m not an expert nor do I claim to be one.
What @ManaManaWegi said is bette advice. I’m just giving you my thoughts based on my personal opinion and what limited info I have about you. But only you really know enough to say
What exactly would mentioning those accomplish? That you can’t deal with Dad, that some think you smoke weed, that you couldn’t do enough research? (You should know MIT doesn’t expect hs kids to publish. Make sure you do know what they like.)
Your GC can mention the pain issue and any missed classes. But the usual help is when he/she can describe how well you did, despite.