Ive been experiencing headache only at the left part of my head and i dont know what to do?

Hydration & exercise: It is not feasible to provide a meaningful opinion without examining you and if your symptoms persist, it would be prudent to see a doctor. However, you may wish to give the following a try in the meanwhile: For good health - Have a diet rich in fresh vegetables, fruits, whole grains, milk and milk products, nuts, beans, legumes, lentils and small amounts of lean meats. Avoid saturated fats. Drink enough water daily, so that your urine is mostly colorless. Exercise at least 150 minutes/week and increase the intensity of exercise gradually. Do not use tobacco, alcohol, weed or street drugs in any form. Practice safe sex.

Needs evaluation: Headaches that occur constantly and present only on one side could be due to a migraines. If this is happening more towards the evening it could be Tension headaches arising from the daily stressors of life. However there are other sinister causes of such headaches therefore you need to see your doctor and possibly get a CT scan done to rule out other worrying causes