Grob, you've had some good explanations here. I would think it very unlikely that the G's you would experience in flight at the basic flight training stage, or in the aircraft type you are flying would be the least troublesome. Nothing you should be doing in that plane should be subjecting you to more than 2G, and this should be easily tolerated by any healthy person. Truly, if 2G is a medical problem for you, medical advice is in order.
For myself, back in the old Aerobat days, I found that 4+ was my limit as the passenger, and I could manage 5+ as the pilot. This seemed about the same for my buddy, as we entertained ourselves greying each other out one afternoon. Any maneuver exceeding 3G would be aerobatics, and I suggest that is not the type of flying you should be doing just yet, unless you are the passenger...