Allergy for 2 years. Advice!

I am writing to seek your professional advice regarding a persistent allergic reaction that has been affecting me for nearly two years. The symptoms resemble mosquito bites, causing me significant discomfort and concern. Despite various attempts to alleviate the symptoms through over-the-counter antihistamines and topical creams, the allergic reaction continues to persist. The affected areas appear as raised, itchy bumps that closely resemble mosquito bites. They tend to occur randomly on different parts of my body and are not limited to any specific location. One doctor prescribed me levocetrizine for 30 days but no permanent result whenever I stop taking it the symptom reappears. Every 2 to 3 days I need to take one cetrizine tablet.