What Causes Depression And Anxiety When Living In Basement?

So my brother has been living in the basement in the house for about 4 years now, and he has some SERIOUS depression and anxiety issues. i recently moved into the basement and have been down there for about a month now, but a few nights ago i had a serious anxiety attack and was panicing, this has never happened to me ever. now that my brother is upstairs he is almost off all his meds, has a full time job, and has little to no signs of depression. I'm not sure what the cause could be. i don't no why it would do this? anything to help?