A person's psoriasis may sometimes get worse before it gets better during a detox. Sometimes when detoxing, the body takes the opportunity to heal a past condition and while doing this, the symptoms of the condition can sometimes surface as they are being released.
Continue to drink lots of water and to eat very cleansing foods (once you begin eating again).
Oatmeal baths can be very soothing here too.
Do your visualizations and imagine the last remnants of psoriasis being cleansed out of your system and this flare up being part of that process.
Do see a doctor or use your medicine if you need to.