Erythrodermic and light treatment

I was diagnosed erythrodermic in late April was put on 10millagrame Acetretin had 8 weeks 3 times a week light therapy I was a lot better got stopped having it waited for a appointment to see the dermatologist after a fortnight it all came back went back to hospital saw dermatologist following week acetretin up to 25 mill and back under the lights again it's not responding yet fed up got a appointment in 3 weeks hope I get some other tablet