Hi, I Was In Gym Today And Did Legs Press

Hi, I was in gym today and did legs press with 90 lb of weight (usually 100/110) and at the end of 30th repetition (usually 20/25) felt suddenly some kind of a snap at the back of my head (occipital region). initially I did not pay too much attention and cont. with abdominal exercises, but started to feel some kind of a head ache. No neurological signs of any weakness or impaired vision. Drove self home. Checked blood pressure it seems usual 135/82, pulse 55, (I am 62 y/o). Have some difficulty moving head up and down and what concerns me most if I try some kind of Valsalva maneuver such as clearing nose, pain in the back of my head increases. (I would assess it as 4/10). I took 1 tablet of butalbital/acetominofen, which usually takes care of my head aches, but after about 5/6 hours the pain still persists. Thought about going to ER, but do not think I have enough physical /neuro signs to justify doing any MRI/CAT scan tests. Called my physician. He advised to take 2 Advils which I did, and see how it will develop. Now it is about 40 min since I took Advil and head ache went a little down.