There is nothing wrong with going to a Chiropractor. It's like any other field out there, you have some people who are horrible at what they do and will do anything to make a buck, and on the flipside you have honest, sincere people who are truly concerned about you as a person.

I worked for a very good Chiropractor for a few years after i got out of the service. He is a dedicated gym rat and i really feel that he could understand your situation and provide you with a logical explanation for your symptoms. IMO, the ligament tear diagnosis is a bit much. In my experience, ligament tears usually come from a traumatic incident such as a car accident (or an occasional rollercoaster ride) involving whiplash. I also don't agree with the M.D.'s advice to hold off from the gym for only a few days ESPECIALLY if his diagnosis is a ligament tear. That's crazy in my opinion. Much more rest and healing is needed.

It makes perfect sense that the two specific exercises cause the headaches. Both exercises put your body under a "load" that could cause a headache. If you are interested in a quality Chiropractor who isn't your proverbial "quack", let me know. I'd be glad to help in any way i can.