How can parents cope with the anxiety of not knowing what's wrong with their child despite repeated doctor visits?

What are some strategies for dealing with the less appealing parts of nursing, like hygiene care, while still maintaining enthusiasm for the profession?
Have you ever had a small interaction with a crush that turned your whole day around? What happened?
Is love always a responsibility and done through serendipity and synchoncity? Does falling in love last a lifetime? Why would a sentient being ever break-up after being in love for that long?