What Causes Dent On Top Of Head, Eye Pressure And Migraine?

Hi I have an odd "dent" that has developed on the top of my head. I have also had a number of other health incidents, severe anemia, bone pain, increased eye pressure, pain in my lower abdomen, migraines etc.. At first I just dealt with each thing as it happened but now I'm starting to think that they might all be linked together some how. Any ideas?