Do i have a brain tumour? is it likely if i did that it would be aggressive, since having symptoms since last october?? weird sensation in head with electric shocks in arms, symptoms pop up every couple of months and go away after a week or two.

Can't speculate: This would be something simple to confirm or exclude by available imaging techniques. Use would be proper if/when you have had a proper history & physical exam that points to the need for such studies. The cited symptoms could be triggered by other simple & treatable issues. It is time to get evaluated & quit obsessing about a potentially fatal illness.

Need to examine: It is not feasible to provide a meaningful opinion without taking additional history, physical examination and may be some tests. It would be prudent to see your doctor and discuss if you may be depressed. Counter-intuitive as it may seem, exercise may help. Start with low intensity exercise such as walking and gradually increase the intensity as tolerated. Wish you good health!