Suggest Treatment For Throbbing Sensation In Base Of The Head

Hi, I'm 20 years old. A week ago today I was doing leg press in the gym and on the last couple of reps I felt a pop/burst sensation at the base/top of my head (left side). There was no pain but a throbbing which lasted for a few minutes. Every time I lift heavy weights on any exercise this throbbing comes back so I stop working out. What should I do? Is this serious?

Thanks