You have been terminated from three positions. With each termination, you have been given the same feedback. You haven’t worked as a nurse for six months. Realistically, getting any job is going to be difficult. And, unfortunately, any bedside position is likely to lead to the same outcome.
While the bedside may not be the best option for you, if you wanted to try it again, I would definitely not recommend an ICU. You may only have one or two patients, but that one or two patients have a myriad of issues going on that will require you to critically think and prioritize.
Other than being a good test taker in nursing school, what are your strengths? Try to capitalize on those.