Pressure on left side of head. One.

I keep getting pressure on the left side of my head. Sometimes the top of my head. Eyes. Forehead and right side of my head. It's mild. Previously between months of gap I used to get sudden head pressure almost always on the left side of my head and very sudden and stops within a few seconds and always happens while my lying down usually during sleep before and after waking up and now for a past few days I keep getting mild pressure. It worries me a lot. I used to get a lot of one sided symptoms over two years ago. I got an MRI at 19 and it said only something sinus related . The symptoms by the way completely stopped after the MRI reports came out and didn't happen for years. This time with the sudden head pressure on the left side of my head between months of gap and almost always happened while lying down in afternoon sleep and maybe happened once or twice while walking. The mild pressure thing that has been happening for the last few days is a little different to the sudden one.