Why

I feel this sadness and start crying for no reason. It just comes out of nowhere and I dont know why. Ive been sick for the past few months and I thought that the frustration and not knowing what was wrong with me was the reason but im starting to feel better and I still have this sadness. Im already a sensitive person. I over analyze everything and I get all worked up over any little thing. Plus this depression feeling but I have no reason at all to be depressed. yes ive
been through things in the past but as of now in my life theres no good.reason for me to.feel this way. I dont know what to do about it. I just want it to go away.