I am allergic to dust, due to the particles being so fine.
Same here, I hate having allergies!
Are your alergiesd caused by hypersensitivity of the immune system also?
I think it is a combination of both, but I am not positive.  I do get sick a lot.  
The immune system is a host defense system, that protects use against disease.
Is there anything I can do to boost my immune system?
I am not sure but for an immune system to function properly it must detect a wide variety of pathogens.
I have taken a lot of antibiotics, so that may have messed my immune system up.
Antibiotic
An antibiotic is a type of antimicrobial substance active against bacteria and is the most important type of antibacterial agent for fighting bacterial infections. Antibiotic medications are widely used in the treatment and prevention of such infections. They may either kill or inhibit the growth of bacteria. A limited number of antibiotics also possess antiprotozoal activity. Antibiotics are not effective against viruses such as the common cold or influenza; drugs which inhibit viruses are termed antiviral drugs or antivirals rather than antibiotics.
Sometimes, the term "antibiotic" which means
Peanut allergy
Peanut allergy is a type of food allergy to peanuts. It is different from tree nut allergies. Physical symptoms of allergic reaction can include itchiness, hives, swelling, eczema, sneezing, asthma, abdominal pain, drop in blood pressure, diarrhea, and cardiac arrest. Anaphylaxis may occur.
It is due to a type I hypersensitivity reaction of the immune system in susceptible individuals. The allergy is recognized "as one of the most severe food allergies due to its prevalence, persistency, and potential severity