Assorted health problems, physical injuries, traumatic memories, doubts/fears about the Church related to past trauma, relationships falling apart or becoming difficult, isolation, painful aridity in prayer, I guess you get the idea.
The way I see it, there’s no way to be sure, whether any of these come from God, the devil or they are simply things that happen to you, without being “sent your way” by one party or another.
What is important, though, is how you deal with these things. You spoke of health problems. It just so happens, that I go through something similar this very moment. Yesterday I came up with a simptom that could be indicative of some very serious conditions. I am very scared.
Today, I felt the need to pray about it. I almost never pray for anything but forgiveness of my sins, faith and humility. I feel bad about asking God for more mundane things, like, for example, health or finance problems, though I have both at present. I feel I should endure whatever He wishes.
However, like I said, I am very scared. So I went into my parish Church, and prayed to Mother Mary. At first, in keeping with what I said above, I simly prayed for the power to endure whatever shoul happen to me. But then I felt the need to bring my fear into it, and my wish for this situation to pass away, and my concerns about not being worthy to ask for health, and my sorrow for having offended God and Jesus and Her with my sins, and my concerns that perhaps my reluctance to ask for health was a way of being too proud, and on it went. However, in the end, it turned out to be a very meaningful prayer experience, and I felt like The Blessed Virgin really listened to me and I could really feel Her love.
So, for the time being, I feel that this problem, wherever it might come from, has helped me to better comunicate with Mother Mary, and for that I am very grateful.