There are several ways. Such as:
Ask another health care professional or doctor.
For example, you can ask your primary care physician for the names of the doctors who do this with whom s/he works regularly (and well). You can ask the nurse in your doctor's office for the names of the doctors who have this specialty. You can ask a pharmacist at the local drug store, a school nurse, etc.
Look in the phone book.
You can look in the phone book (in the US) in the "Yellow Pages" under "Physicians and Surgeons" (or something similar) and then by specialty. Also in the phone books there is usually a section that lists emergency numbers and community resources. In some locations, there may be a phone line listed for Physician Referral Services which is something that some hospitals, other institutions, local government, or community service groups provide.
Call the local hospital information line.
You can call the information line at one of the hospitals in the area. The operators who answer usually have a directory that lists the specialists who work at their hospital, and can give you the phone number to their offices or can transfer you to a department who can give you that information. You may need to help them by giving the list of possible types of specialists who work in immunology (see below), since they may not be medically trained.
Physician Specialties with a focus that includes the immune system:
The physician specialty areas that would usually have at least a partial focus on the immune system include:
Some Internal Medicine specialists and Family Medicine practitioners also may have an interest and specialize in treating immune system diseases, such as HIV and AIDS.
No it can help it by boosting your immune system
An endocrinologist.
immunologist
An immunologist is a medical professional who specializes in the human immune system. The responsibilities of an immunologist is to either research immune system disorders or to treat them.
An Immunologist is doctor who specializes in the study of the Immune System. Immunologist may perform research, or treat patients who have complications with their Immune System. Immunologist are always looking for different ways to improve our body's defense. From antibiotics, to our own antibodies; Immunologist know them all.
Herbalists consider ganoderma an adaptogen, or natural regulator, suppressing the immune system if it is overactive and boosting it if it is underactive.
Urologist (also the urinary system)
Hematoligist
Cardiologist
I think you mean a gynaecologist - a doctor that specializes in women's health, especially the female reproductive system.
The type of medical doctor that specializes in the digestive system is called a gastroenterologist. he also deals with gastrology
If your doctor suspects you may have gallstones, you may be referred to a doctor who specializes in the digestive system (gastroenterologist) or to an abdominal surgeon