Meltdowns are pretty much inevitable in life. If you know desire, you're bound to know failure + shortcomings. And meltdowns are a part of it. We break, we give up, we crack open. It feels horrible when we're in the midst of it. Thoughts we barely recognize our own crowd up our mind. Depression can take hold of us.
So instead of trying to hold ourselves together, despite the destructive forces taking us down, why not let it take us down? Why not cry compassionately? Why not be sensitive + fragile? Why not feel our sorrow?
Everything in life is a clue for happiness. I'm always learning something new, especially about myself. And it's okay not to be happy & peppy all the time. Be melancholic, spend a few days in sorrow. These emotions are not your pure Self, so there's nothing to fear.
The lack of love we feel in a meltdown can be very disconcerting. Don't buy into it, don't act on it. Tend to your heart, or be of service to someone else, & soon your meltdown will have melted away.
Keep your heart open & tender. Breathe in the present moment. Be real.