Oh yes. I would definatly say its an illness. After all its something you cant cotrol. I suffer from this also...and if people could control it they would. nobody wants to be sad. I just want to tell you it will be okay in the end and that your not alone. ((((((ouch)))))))
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Turn to me and have mercy on me, because I am lonely and hurting.
My troubles have grown larger; free me from my problems- Psalm 25:16-17