What are the possible causes of regular headaches, dizziness, weakness, and pain at the back of the head?

I am a 37 years old female. From the past few days I am feeling an ache inside the left side of my head at regular intervals. I also feel my head spinning and heavy quite often. Sometimes I feel cold and sometimes I sweat. I also feel my body weak quite often and sometimes feel I may fall. Sometimes I feel a pull on the backside of my head and that part paining, though it isn't a severe or constant pain. I am not able to tell this to my parents as they recently faced a huge tragedy and I don't get the courage to speak to them and give them more pain. Since the time I get up I look forward to going to sleep again as that's the only time I feel better and tension free. Is this a passing phase or serious health issue? Are these signs of brain inflammation/tumor? Will be grateful to you if you advice me what my next step should be.