If I rescue someone from drowning in the pool and in that process I end up saving the drowning person but end up injuring myself so will I be able to use the Rescue Doctrine and claim damages from the defendant/drowning person?

Voluntary assumption of risk / Consenting to  run a risk

Volentie non-fit injuria doesn’t permit you to get compensation for the injury suffered when you rescue someone out of your own choice. According to the doctrine, “to a willing person, no injury is done.” This doctrine holds that a person who knowingly and willingly puts himself in a dangerous situation cannot sue for any resulting injuries. Therefore no compensation for injury in voluntary rescue performed by you.