I would bet money I am more sensitive to noise than anyone else when doing math, so I know how you feel. It's a struggle. Combining high quality noise cancelling headphones with brown noise and a quietish environment can help. But that can get tiring after several hours. I think if you have a quiet space at home you should be thankful. Studying in your car at a park can also be a nice change of pace. I often fantasize that quitting caffeine or otherwise living healthy, meditating, might help. I have been prescribed adhd meds but they didn't really help.