Mirtazapine withdrawal

Hi everybody I am currently attempting to stop mirtazapine. I've managed to come off of it at least twice over the last 5 years and only stuck to a low dose of 7.5 mg. I was initially prescribed it for a sleep. It worked well at low dose until it stopped some two months ago. I made a mistake of upping the dose to 15 mg, which made me semi- psychotic !!! Paranoia, extreme anxiety, agitation. After two days and emergency appointments with several GPs where I was advised to reduce to 7.5 and then swap it for venlafaxine. Somehow I fear it is not a brilliant idea given that venlafaxine is even harder to quit. I tapered off to 7.5 hoping that it may work again and, although it eased anxiety, I still felt horrible : 2 hours sleep, constant panic attacks, dizziness, depersonalization. In desperation I decided to start tapering off - at first to 6 mg. Been on 6 for a week and anxiety and dizziness are even worse and constant. I know it may take several weeks to even out as the brain adapts. Has anyone got any advice on how to survive it? Love to All Rob