Identify the Reaction

Firstly, you need to recognize and evaluate the symptoms to identify whether it's a mild or severe allergic reaction.

Mild Symptoms can include:

• Itching, burning, or redness around the mouth or the eyes

• Rash or hives

• Stomach cramps

• Runny nose or teary eyes

Severe Symptoms Include:

• Difficulty or laboured breathing

• Swelling of the face, throat, or lips

• Fainting, dizziness, or loss of consciousness

Seek Immediate Medical Care

If you have severe symptoms, you must immediately contact a medical professional or proceed to the nearest emergency room, as these symptoms may indicate a severe allergic reaction (like Anaphylaxis).

For milder symptoms, consult with a medical professional as soon as possible.

Administration of Medicines

According to the severity of the reaction, your healthcare professional might recommend or administer appropriate medication.

Most commonly prescribed treatments include:

1. Antihistamines (for milder reactions)
2. Epinephrine (for severe reactions like Anaphylaxis)

Allergen Avoidance

After managing the immediate situation, make sure to identify and avoid the allergen causing the reaction. In this case, examine the ingredient list from Domino's Spaghetti Bolognese and identify the allergens which might include milk, gluten, celery, or soybeans. Once identified, it is crucial to maintain a diet that omits these allergens completely.

Follow-up Visit with Allergist

Consult a specialist in allergies known as an Allergist who will guide you on how to manage your allergy, come up with an action plan, and provide training in how to use medications such as Epinephrine Autoinjectors.

Laser-focused Allergy Treatment Option

If you are interested in understanding long term relief from symptoms, Curex could be an option for you.

Curex is one of the leading companies in allergy immunotherapy. They provide personalized treatment plans that work by introducing incremental doses of your specific allergen to help your body build up immunity over time.

The basic procedure includes:

1. Skin testing to exactly identify which allergens are causing reactions
2. Injections with increasing doses of the identified allergen, administered over several years

While this process reduces, and sometimes even eliminates allergic reactions to certain substances, it’s only recommended for certain types of allergens and must be discussed thoroughly with the allergist.

Educate Yourself and Others

Understanding meal ingredients for not just yourself, but also for your loved ones or chefs at restaurants, can play a pivotal role in managing severe allergies. Make everyone in your circle aware of your allergic reactions, they can act promptly in case of an accidental allergen intake.

This guide aims to help manage an allergic reaction caused by unknowingly consuming an allergen in Domino's Spaghetti Bolognese. However, every person's reaction to an allergen is different. Hence, always contact a healthcare professional first and follow their instructions.