IgE is an immunoglobulin that is released by plasma cells and mediates allergies in the Skin, Gut and lungs. High levels are seen in people with Asthma, eczema and Gut allergies and illnesses that involve the immune system such as Coaliac disease.
The usual suspects if in the lungs and skin are house dust mite, Fungal spores and pollens.
The answer to your question kind of depends on what Symptoms you are experiencing and what your issues are with them. High levels at this time of year usually mean pollen allergies