Hi, I've been suffering from a constant pressure in the lower part part and top of my head, causing me troubles focusing,memorizing and thinking. I've been lethargic and powerless and my hands occasionally shake especially when I wake up. Which never happened before. I'm kind of worried science i haven't been able to focus or memorize information in school either, and its causing my grades to sink. I don't want to assume the worst, but I'm worried it might be a tumor