No, you cannot be released from your lease. Why? Because the problem was addressed and repair.
You said it has started again. Again, YOU have to give notice to have it repaired. This time request in writing that the problem was not resolved and you would like for it to be looked at and taken care of.
If they did not look into it, did not repair, and it happen again and you sent a request and nothing was done, than yes, you have a reason to break the lease.
This time of the year, and the weather changing, everyone has some type of cold syptoms you are describing. A doctor that specialize in allergies will have to document it was from whatever that dust is.
Using the word, "fiber like" does not mean asbestus which you are trying to tie into. It won't work. It is just lint from clothes.
Sorry, but your financial problem is not the LL problem.

