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Didn't want to read and run. That looks incredibly painful. Have you spoken to your GP about possible pain relief?
You could ask for a referral to the pain clinic. I've been a couple times for myself for a long term painful condition. They are great and discuss both your type of pain and create a combination of pain medications tailored to your needs. I was even able to try out a trial form of pain relief not available through my GP so might be worth asking for a referral.
I currently have a repeat prescription for co-codomol 30/500 but sometimes buy Solpodine Max (co-codomol 12/500) when I need a strong pain killer but want a break from my strong ones. You can purchase it over the counter at pharmacies.
But my condition doesnt involve my skin, so hopefully someone will come along with advice specific to your needs