yes it is ok if thats what you need ... a place to just vent and someone to listen to you vent. I know many people who see their treatment providers for this. I have also walked in to my therapists office and said "I just need you to listen today, this that and the other thing is going on and ....." then after a while I wind down and my therapist says How are you feeling now that you have gotten that off your chest? and I say wonderful thanks see you next week?

therapy sessions is for what ever you need to work out that you cant work out on your own and that includes having a place to go just to unload / vent with someone listening.