I'm not looking for reassurance I just want to ask a question. I've been feeling numb and a lack of energy but I dont think it's the thoughts. Could ocd snowball into a sort of depression?

A lot of time, people with OCD also struggle with other mental illnesses such as anxiety, depression, ptsd, etc. It definitely can bring about or reveal mental illnesses you didn’t know you had. After all, dealing with OCD thoughts all day can be terribly draining and is bound to get a lot of people exhausted and down. Keep your head up, you got this.