There is no such thing.
And as you say, you are paranoid about this.
This is a psychiatric problem at this point. You might not believe this, but you are describing impossibilities, and fixed delusion. This is a difficult condition to treat.
I believe you get a bite occasionally, but it is not from spiders at this frequency, rather flea, mosquito, bed bug....etc.
You need to
a. have an exterminator out
b. Talk with your primary care doctor about seeing a psychologist or psychiatrist.
c. If there are really spiders, samples can be collected: however, there will not be, and this will help you get to the bottom of this problem.
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