I have a high IgE reading up to 2000. What could be the causes of this. Also get swollen tongue quite often, with ridges on side from teeth.

Allergic bruxism? The scalloped ridges on the side of your tongue likely are from nighttime clenching or tooth grinding. In 1980 marks published an article in the ajo about the link between bruxism and allergies in children. It is available on pubmed. See your allergist and dentist for treatment.
Allergy. High IgE reading indicates that you are allergic to something. More testing is required to determine the allergen(s). Swollen tongue is worrisome as it indicates that your allergy is affecting your airway. See your Primary Care Physician and ask for referral to a specialist Allergist.