Hi, for the last few weeks my head has been feeling heavy and foggy. is there something i can do about this? it seems to be worse when its hot.

This is a vague: non-specific symptom. It could have something to do with your sinuses being congested, infected, or fluid-filled. Not sure why heat would affect it ... but there is no doubt you should be evaluated. See your doctor or specialist/Neurologist who will take a detailed history, examine you and probably suggest tests..I would likely start with a CT scan of your head. Good wishes:)