3 months ago I started to have a headache that hits me like a thunder. It's on my left temple n left forehead. Lasts for seconds & it's frequent?

Migraine variant. These kinds of headaches may be termed thunderclap events, but are also termed icepick headaches, and could be prevented with a number of interventions. See a neurologist who has experience with migraine syndromes, as each specific variant may do well with different prophylactic approaches.