My knowledge of psoriatic arthritis is quite poor, as I don't have it and I haven't covered it for that reason.
I'm really sorry to hear your psoriasis Is behaving so unpleasantly at the moment. To be honest, by "let down by the system" j mean the poor access to dermatologists. That doesn't just affect the actual chance of starting treatment, but what if you don't respond, or the side effects are unpleasant. What's the option then. Wait another 6 months to a yesr for a followup? People (myself included) just feel abandoned, and for that reason I recently went private which is against my moral code, but I found out that I can be barred from working clinically if its active on my hands and lower arms 😮
Lifestyle absolutely helps and there is one thing that's absolutely certain - if you ate crap and didn't exercise your psoriasis, as it is right now, would be much worse. As would your risk of all the health complications of psoriasis.
I can understand not wanting to do the next step of treatment. I managed for about a decade with UV therapy at home. If I'm honest, the therapy never had a great affect on my psoriasis. If I was lucky enough to clear it, some patches never did, and at best I was left with dark skin areas where the psoriasis had been and It would come immediately back when I stopped. It also made me feel like crap - much worse than the acitretin is. The nature of uvb therapy is to give just enough to kill the inflammatory cells in the plaques (they then release loads of inflammatory chemicals causing that "sun kissed" feeling of BLARGH.
Acitretin is fine. I took a week off as I was getting headaches and touchwood they haven't restarted again yet (I'm a fortnight on from my break). Dry lips are creeping back, but my psoriasis is quite flat. I'm finding if I get ill, however, I flare up regardless. As I have young children and work with sick people, this isn't ideal.
I have a few colleagues who are on biologics for other conditions, and they say the side effects are non existent for them, and their own disease are in remission. It's just a cost thing isn't it - you cant stick everyone with psoriasis on them so you have to game the system.
Good luck!