How come I feel sad and feel like I’m about to cry but produce no tears? Why do I sometimes feel like I have no emotions at all? Could this be depression? A few doctors have diagnosed me with it but t

Well, it may indicate that you were repressing your emotions and got used to it. That is why it is very difficult to release them - it is because you kind of forgot how to express your sadness in a crying way. And because you struggle to let your emotions out, it may be that they are trapped inside of you, waiting to be released. It feels like you are in a place that you need some psychoterapy ( that means professioinal sessions with psychoterapist, where you would experience the release of your repressed emotions). So basically I advise you to now stick to your dgnosis, but focus on working with yourself for improvement.