Help

Guys I have bad neck posture and sitting posture ..I used to get pressure in head and headaches randomly and lightheadedness...when I corrected it a bit it stopped ..but now it again came back..thr is a small amount of lightheadedness but still I feel a strange pulsing behind my head like its making my eye feel weird not much...whe I sleep i hear it clearly its difficult to focus also help guys pls