Hi. A psychiatrist can write medications as well as offer treatment with therapy. Not all cases of depression need medications, but if the symptoms are severe, medications become necessary. You can chose either. A psychologist will let you know if you need medications and a Psychiatrist will offer you therapy if required.
Next Steps
Personally, I would suggest a psychiatrist as he can decide which one of the treatments would be better or if you need a combination of both.
Health Tips
Don't delay the treatment. Earlier the treatment is started, better is the response.