Hey Random,
I am so sorry you're dealing with all of this. It's so frustrating when people are dismissive or feel you're doing this stuff for "attention." No one would choose to have these problems or feel this way but sadly people who are unaffected just don't get it.
As others said, if you can, find a neuropsychologist or concussion clinic. I know you're limited due to your age (meaning like you can't drive yourself there)...so I hope your family will be more supportive. As someone else mentioned, you should show your mom or dad this forum to help them understand what you're dealing with is real.
I had a similar episode like what you're saying in regards to having that crazy dream/anxiety situation and then being in a total fog the next day..... I couldn't think, read, focus, nothing at all.. I can't really offer much insight as I haven't gotten to see my doctor yet, though he's aware of what happened. The best thing to do, if you can, is to rest. Total silence or relaxation music. Or even binuaral beats work well but they sound super weird and take a little getting used to and you definitely need headphones for them. Relaxation music will help you in a lot of situations.
Take fish oil pills. I know it sounds hokey but my neurologist has me take them and it's backed by research that it can help your brain. That and green tea.
I hope I was helpful and did not come off as an ***. I hope you feel better soon.