You may want to make an appointment with a psychiatrist to treat not only your Arachnophobia, but the slight OCD (obsessive compulsive disorder) thact accompanies it. You can discuss if a course of medication is appropriate or just "talk-out" your fear with a professional equopped to help you. Afterwards, the psychiatrist may refer you to a psychologist to continue counseling related to your phobia.
I undertand what you are experiencing as my husband suffered from the same problem, nut has since learned to overcome it via a course of psychotherapy.
http://www.phobiascured.com/arachnophobia.htm
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