Unfortunately mental health is not considered seriously in my country. The older generation doesn't believe that there can be any issue with the mental health.
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My friend once told me that he had been staying depressed for long and felt like ending his life. I suggested him to talk to his parents and get them to take him to a therapist. He was reluctant, but did so on my insistence and I would be joking if I am saying I am not repenting on my advice. His parents told him that he was stupid to think about going to a therapist because all they do is prescribe sedatives and empty your pockets. He visited a therapist on his own and was diagnosed with bipolar disorder. He is recovering now and his parents are least bothered.
Mental health can be a lot more dangerous than physical heath. So, if you feel your loved one is suffering then don't waste time waiting for the phase to pass, because it probably will never do.