These emotional cycles are difficult and I am sorry you are going through them - I guess pretty much everyone here will have been through or will be going through the same type of feelings. So at least you are not alone and if they can cope you will be able to in time.
I have pasted a poem by Rumi below. I read it carefully and googled about it - to find deeper meanings. It helped. I hope it helps you. It is called "The Guest House", by Rumi..
This being human is a guest house. Every morning a new arrival.
A joy, a depression, a meanness, some momentary awareness comes As an unexpected visitor.
Welcome and entertain them all! Even if they're a crowd of sorrows, who violently sweep your house empty of its furniture, still treat each guest honorably. He may be clearing you out for some new delight.
The dark thought, the shame, the malice, meet them at the door laughing, and invite them in.
Be grateful for whoever comes, because each has been sent as a guide from beyond.
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