You might want to see a counsellor or psychologist to get a proper diagnosis. I would caution you on simply searching the web and forming a definitive answer this way as most psychological conditions require lengthy diagnostic criteria which require a professional to assess. Online information and screeners are useful but they should not intended as a diagnosis. OCD requires specific treatment so if this is something you suffer from it's important to get a diagnosis.
If you are also suffering from depression this program will likely be a good jumping off point. Have you had a chance to get started? Any questions so far?
Maybe you could consider consulting your doctor, he could be in a better position to evaluate your situation.
It seems you are under a lot of anxiety, because you have some doubts and spending considerable time researching so you could came with an answer. There are things in life that it is difficult to have an answer, and the more we research about it the more questions we have, ending frustrated and even exhausted. I have the same problem, I tend to obsess about things but fortunately I recognized this pattern and slowly I am getting better at dealing with it. This does not mean we have a disorder, it is a trait of our personality that we could use even in our favor, but we have to manage it.
For the past year I have been feeling constantly depressed and yet I am sure there is more to the problem than that. I would love if any of you have ideas as to what.
For the past year, I was convinced that I had OCD because I have obsessive religious doubt that leads me to spend hours analyzing religious ideas in my head and reading religious books. These questions distract me from completing many important day-to-day tasks because I am so precoccupied. I get some anxiety if I just ignore these thoughts. They make me miserable and make me feel like life is empty and unjust.
However, these are not disturbing or sexual thoughts about religion, which seems to be the only kind of thoughts considered actual OCD. Besides repeating scriptural quotes in my mind often, I do not really have many compulsions. It is just a constant worry about religious themes and a feeling of my brain being "cluttered". Someone told me I might just have "obsessive thinking", but I could barely find any information on it when I googled it; I am not sure it is an official disorder.