It can help and also hurt, depends. You have some mild situation that is quite common? Good chance it will give you good advice.

Something more complex, more towards clinical psychiatry rather than shoulder to cry on/complaining to friend over coffee (psychologists)? You are playing a russian roulette that model in your case won't hallucinate something harmful, while acting very confidently, more than any relevant doctor would be.

There have been cases of models suggesting suicide for example or general harmful behavior. There is no responsibility, no oversight, no expert to confirm or refute claims. Its just a faster version of reddit threads.