For some people, taking 4500 mg of methylcobalamin every day can be dangerous. If you take too much methylcobalamin, you might get an upset stomach, diarrhea, or a rash. Talk to your doctor if you feel unwell. They might change the amount you take or give you another kind of treatment. 

While headaches can have various causes, including migraines, tension headaches, or sinus problems, it's important to rule out any underlying conditions. Consult a neurologist..; they may order additional tests or imaging if needed to determine the cause of your headaches.

Your friend could be having a panic attack. A state where the person has rapid breathing, cold hands and feet, sweaty palms, and feeling unable to move is the most common one during a panic attack. The reasons may be different but the stress or anxiety stage is often the cause. Advise your friend to breathe slowly and deeply to stay calm and composed. Offer them strong reassurance and be a steady presence to help them through it.

It seems like you might have systemic hypertension—this can lead to symptoms such as pain in the hands or feet, blurred vision, or more phlegm. These are all signs of high blood pressure. You need to check your blood pressure regularly and do what your doctor says to keep it under control. Changing your lifestyle by eating well-balanced meals, getting regular exercise, and dealing with stress can make things better for you.

It's normal to misplace or forget things sometimes especially when life gets busy or when you are feeling overwhelmed by the things to do. Forgetting a password or misplacing your bag occasionally is usually nothing to worry about at your age. Get enough sleep, eat healthily, and manage stress to help boost memory. If you're unsure, consider keeping a task list ready or utilizing the reminders on your phone to keep you structured. But if you have worries, getting in touch with a healthcare provider is a great alternative to get yourself tested and put your mind at ease.

Experiencing pain in your head and high blood pressure can cause something more serious. You should seek medical attention immediately to get the proper diagnosis and treatment. Some more tests may needed for complete diagnosis.