Thoughts and opinions on phototherapy.

Hi everyone, I was diagnosed with psoriasis in June this year after last year discovering thick scales starting to form on my head. I naturally thought nothing of it until 80% of my head was covered. I initially went to the doctors where they unfortunately let me down multiple times until I had no choice but to go private. A few weeks before my diagnosis I noticed a couple patches on my body, my shoulder, chest and just by my ribcage and after my diagnosis counted myself very very lucky that I had only a few patches on my body and was prescribed Enstilar which seemed to be working wonders on my scalp. However, the last three weeks have proven to be very difficult and now I am covered head to toe in red, flakey, sore and itchy patches which are quite large; Especially on the backs of my legs which make sitting down very painful. Enstilar now is having no effect at all. Every morning I am waking up with more on my body. I am a 19 year old girl and this is having a dramatic effect on how I am feeling and seeing myself. It is quite distressing seeing more red patches than I am my own skin. I am embarrassed for my partner to see my body but am very lucky he is one of the most supportive people including my family. I am still struggling to get a doctor's appointment and don't really want to go private again because it was very expensive. Looking at peoples experiences with medications given to them really frightens me and nausea and sickness being a big side effect is terrifying as I struggle with emetaphobia. I really would like to do phototherapy as speaking to people they have had really positive experiences with this treatment but would really like to gain some more knowledge and here peoples thoughts, opinions and own experiences. Any advice would be so appreciated as I am the only one in my family to be diagnosed. Thank you so much in advance :)