Hello,
Thank you for asking at HCM.
I went through your history and would like to make suggestions for you as follows:
1. I would like to know the "allergy tablets" that you are using. If they contain 
montelukast or antihistamines, I would say they will be safe for long-term consumption as common side effects are sedation (antihistamines) and 
stomach upset (montelukast) only.
2. However, if you are taking 
corticosteroids as "allergy tablets" I would suggest not to take them without doctor's prescription and take them only when necessary, as few as possible.
3. I would like to mention that both 
asthalin and "allergy tablets" usually control allergy-asthma symptoms, they cannot "cure" allergies or asthma.
So I would suggest you allergy testing, which will help you identify the substance you may be allergic to as well as to know the measures to avoid them.
4. Based on allergy testing, an Allergist-Immunologist may prescribe you allergen specific 
immunotherapy which gradually improves your allergy symptoms by working on immune system.
Hope above suggestions will be helpful to you.
Should you have any further query, please feel free to ask at HCM.
Wish you the best of the health ahead.
Thank you & Regards.