Was being choked (under my consent) during sex. i have pain under the left side of my jaw. the lymph node feels slightly swollen. should i be worried?

Just be careful: If you have no bruise, swelling, or difficulty talking, breathing or swallowing it is probably not a problem. Might even be completely unrelated. However, if you do have any of the above other than a bruise, you need to be checked for injury. Don't ever try to pass out even in play. You might not wake up. Always discuss what to do if worst happens. Do you have a safeword? Was it used?

See MD: I would recommend seeing the MD to evaluate the area. It is always possible in a choking situation that the bone under your throat/jaw (hyoid bone) can be damaged / broken. Important to have this checked as soon as possible. Urgent care, ER, family MD -- get seen while you are still having symptoms. This is how fatal accidents can happen. Good Luck.