***Thanks PurpleFrog, will admit I don't know much about ergonomics but do know what I feel is comfortable on my bikes***
For work reasons, I know quite a bit. Comfortable isn't always a good guide - once you have a problem, my advice is to do some research and understand the fundamentals.
Ergon grips are usually 20 or so for the cheapest model, yes. If you can tilt them so that your wrist is aligned with your arm - ie no bend in your wrists - that's ideal. I think Mary bars would better, even if they do sound like something in a John Waters movie, but Ergons are a start, and the two can be combined.
..The best picture to post would be of your wrist posistion on the bike, exactly as for riding, from the side and above. Nothing else is really much use - it's about how you and the bike fit together, nothing else.
Good luck, and when in doubt "Do no harm" - back off riding until you get it sorted; it shouldn't take long.