It sounds like you might need a change, but it doesn't sound like this other job is the right fit. I agree with the volunteering. If you have a new found love for folks with AD, then I am sure the Nursing homes would love you to come to talk to the folks, help them with little tasks that would make them feel a sense of accomplishment...kinda adopt them. Then, you have the best of both worlds. Sounds like you are comfortable in your current job and have a lot of freedom. Continue to look for something that will help give you a sense of fulfillment, but don't jump into something that you already have doubts about. Good luck.