I'm extremely allergic to insect bites esp spiders besides a ridiculous over reaction by my immune system any other possible reasons for this?

Happy to help: As you mentioned, those types of reactions occur in patients with a very strong immune system or response. This type of immune system is often associated with allergies to environmental substances such as pollen, dander, dust mites, etc., or foods. The underlying theme in either case is a very strong immune system that "overreacts" to these triggers.

May not be allergic: Reactions to insects range from local reactions to life-threatening anaphylaxis. Spiders usually cause local reactions, which can get large and may get infected. These symptoms are due to local irritation of the skin, which results in local inflammation. Signs of anaphylaxis include a combination of hives, swelling, breathing difficulty, vomiting, passing out due to systemic histamine release