Dream about someone holding you underwater is an omen for your insecurities and your fears of being abandoned. You should not underestimate someone’s ability because of their size. You may need to change your old habits and old ways of thinking. The dream is about deception, evil and treachery. There is a problem that you need to be cautious in the way you handle it.
Someone holding you underwater dream is a premonition for a situation that you have been avoiding. You need to stop dwelling on the past and look toward the future. You need to be more yielding in your point of view and decisions. The dream is sadly an admonition for your tendency to go against the norm and break the rules of convention. You need to learn to verbalize your desires in order for others to know what you want.
If you dreamt about someone holding you underwater:
At the moment your partner (current or prospective) is confused by some of your behavior, especially when you seem to withdraw and keep fairly quiet. You just have to reassure them that this is not a personal snub, but the way you regenerate.