Hi Shakaz,
Welcome, and that's a really good question.
I think it's important to understand that there are some critical differences between a Psychiatrist and a Psychologist and a GP.
A Psychiatrist has a medical degree and have trained in a medical arena prior to branching out into Psychiatry. They are Drs and can therefore prescribe medication, make admissions to hospital, and even care for you while you are in hospital. The other advantage to seeing a Psychiatrist over a GP is that they have a very thorough knowledge and understanding of medications for mental illness. They will often prescribe higher doses than what a GP will because they know the effects and can better monitor you whilst you take them. It is highly possible that if your Psychologist thinks you are unwell enough to be in hospital then you might be better off taking more than just a low dose anti-depressant. Some Psychiatrists will offer talking therapy as well (similar to that of a Psychologist) and if this is the case I think you can be guaranteed that there wont be any conflicting information as they are trained in the same approaches that are used in the field of Psychology.
A Psychologist on the other hand is pretty much limited to talking therapy. They cannot make diagnoses, prescribe medication, or arrange for hospital admissions.
There is no reason for you to stop seeing your Psychologist just because you begin to see a Psychiatrist. I see both and this works perfectly fine. If I've spoken to my Psychologist about something, when I see my Psychiatrist I raise it with her and let her know what strategies the Psychologist has recommended for me, it avoids having to double up on information, which would otherwise become exhausting. You will probably find that if you start seeing a Psychiatrist you wont need to continue seeing your GP regarding your mental health, as at the moment s/he is primarily looking after your prescriptions, and this won't be necessary.
I hope this helps.
AGrace
