It seems you have already been told the source of the allergies from your first post.
Your doctor seems to have run out of answers (which leads to speculation on normal everyday things, but did they ask about new perfume for your mom, new deodorant, soap, after shave, clothes, laundry detergent, new plants or trees in the neighborhood, new foods, new drinks, old filters in the HVAC, etc.) Maybe they should refer you (again?) to a specialist who can test you for allergic reactions to things in your room and house that you have not been told about.
http://www.webmd.com/allergies/guide/allergy-prevention
http://pittsburgh.cbslocal.com/2016/11/11/determining-cause-of-winter-allergies-can-prove-difficult/
A specialist can test you for mold, carpet fibers, dechlorinator, and a hundred other causes. But mold in particular isn't that likely unless you spilled gallons of water on the carpet or have ulta-high relative humidity in your room.
I think testing the humidity as it was suggested is the easiest step to cast light on the aquarium, but having had several relatives with huge allergy issues, I can tell you they often had problems finding causes.
That doesn't mean one shouldn't try to figure it out of course. However, it'd be an absolute shame if something you cared about was the cause, so I wish you luck on that.