Is it ok for lay meditators to have counsellors/therapists/psychologists
Both Mediation and Counselling can help. Talking about something can help you lighten your mind. Similarly meditation can help your reduce stress. But it is best to keep them independent without having spill over from one form of perspective to the other when you meet the respective people / crowd.

If there is any perspective which contradicts the other, you can evaluate both and decide whether to choose between them or formulate your own perspective.

The main idea in Buddhism is to see things as they are. So be prepared to set aside any perspective you build from either advice or your thinking when you see things for yourself through your practice.

Following courses also might be of help:


Buddhism and Modern Psychology
Buddhist Meditation and the Modern World