Seeing a Psychiatrist...or not

Hi everybody, this is my first post. I'll try and keep it brief as poss. I was unwell 15 years ago and was sectioned twice. Diagnoses were constantly changing 'likely schizophrenia', psychotic episode, bipolar etc etc I do not have good memories of this period. I have over the last 10 years managed to complete a second degree and mostly stay in work.  There have been a few ups and downs and difficult periods where I have had to take time off work, change jobs etc or stop work. I have had some major depressive episodes. I had a period last year where I became depressed and delusional/psychotic..this really scared me.  I have not engaged or needed to engage with mental health services for the last 10 or so years and feel this has been the best way. However, I recently went to my GP to ask about changing my antidepressants (I came off all other meds myself) and she won't do it without me seeing a psychiatrist. I was so disappointed and am scared of getting caught up in mental health services again. Feels like things will just spiral our of my control if I do...but what happens if I don't. Sorry..it's consuming my thoughts. Thanks for any feedback. :)