Hi, I have a "twin" in my left temperal lobe which swells up quite alot. Is a pain (not a headache) in the back left hand side of my head related?

Does not add up. Your question , if there is a question in not understandable. You may wish to restate.
Wish you 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, if you have sex.